The acorn symbol on a gatepost is easy to miss. Once you start noticing it, it changes how you read a map of England and Wales. It marks the National Trails: long-distance routes running through coastline, moorland, chalk downland and border country. You do not have to walk one end to end, and most people never do. Two or three days on a National Trail is one of the best-value adventures available in Britain, and far more manageable than the through-walking accounts suggest.

What National Trails actually are

National Trails are the official long-distance routes of England and Wales, designated by government and looked after in partnership by Natural England, Natural Resources Wales and the local authorities the route passes through. There are around a dozen of them, ranging from the South West Coast Path, the longest, to the Yorkshire Wolds Way and the Thames Path.

Designation matters for practical reasons. It means the route is waymarked at every junction with the acorn, that the path is legally recorded and maintained, and that guidebooks, maps and reasonably reliable transport information exist for it. Most National Trails are not purpose-built tracks; they stitch together existing footpaths, bridleways and quiet lanes.

Walking them costs nothing. Almost every mile crosses private land, though, so stay on the waymarked line, close gates behind you, keep dogs under control where livestock graze, and carry your litter out.

Choosing your first section

Deciding between the Pennine Way and the Pembrokeshire Coast Path is the wrong question. Choose a section instead: two or three days of walking that fits your travel time, your current fitness and the time of year.

Terrain before distance

Miles on a level former railway line and miles on the South West Coast Path are different animals. Coastal walking adds a short, sharp climb at every cove, and the effect builds through the day in a way a flat map never shows. Moorland routes such as the Pennine Way bring peat, bog and proper map-and-compass work. Chalk downland like the South Downs Way is gentler underfoot but exposed to wind and short of water points.

Escape routes and direction

For a first outing, pick a stretch with more than one way off it. Then check the following before committing:

• Does a bus, train or taxi link reach the middle of the section if you need to stop early?
• Are there at least two places to sleep within reach of each day's end?
• Will the ground be heavy clay in winter, or springy chalk in June?
• Which way does the wind usually blow, and would you rather have it behind you?
• Is there a station or car park at both ends of the walk?

Working out daily distances

A useful rule of thumb from hillwalking is to allow an hour for every 5 km (3 miles) on the flat, plus an extra hour for every 600 m of ascent. Then add time for stops, photographs, wrong turns and the long chat with a farmer about a stile. That final figure is your day.

For a first trip, 12 to 16 km (8 to 10 miles) a day is a comfortable target on easy ground. Where the hills come thick and fast, drop to 10 or 12 km and see how you feel on the second day. Make the first day deliberately short. You will spend it adjusting your pack straps, your boot laces and your pace.

Guidebook timings are written for fit walkers moving steadily with brief breaks. If you like to stop for lunch, add a third again to whatever they suggest. Walking to someone else's schedule is the quickest way to turn a good route into a chore.

Getting there, and getting back

Sort transport before you book anywhere to sleep, because it often decides which section is realistic. Several trails were routed with the railway in mind: the Hadrian's Wall Path runs close to the Newcastle to Carlisle line, and the Ridgeway and South Downs Way both have bus connections from nearby towns. Rural services can be infrequent or summer-only, so check timetables for the exact day you are travelling rather than assuming a weekday service runs on a Sunday.

The usual solutions:

• Walk between two stations. The cleanest option, and it makes a linear route as easy as a circular one.
• Use a baggage transfer service on the busier trails, and carry only a day pack.
• Leave one car at the finish and take a taxi or bus back to the start.
• Base yourself in one village and walk out and back, or use a local bus to vary the route.

Beds, bases and booking

Trail accommodation covers the full range: YHA and independent hostels, bunkhouses, campsites, pubs with rooms, bed and breakfasts and small hotels. Book ahead from May to September and around bank holidays, particularly on the Pembrokeshire Coast Path, the Hadrian's Wall Path and the South Downs Way, where beds in the popular villages are genuinely limited.

For a first attempt, staying two nights in one place often beats moving on. You leave the heavy items behind, walk with a lighter pack, and get a proper look at a place rather than just passing through it.

Camping is worth considering on the quieter routes, but note that wild camping is not generally a legal right in England and Wales. Ask the landowner first, or use a campsite. Before you travel, check the official National Trail page for your route: diversions, closed footbridges and temporary path changes do happen, and that is where they are listed.

Packing light and keeping it simple

You need less than the internet suggests. A waterproof jacket and trousers, a spare warm layer, boots you have already worn in, socks you trust, water, food, a paper map with a compass or an offline map downloaded to your phone, a headtorch, a small first-aid kit and a power bank. Mobile signal is patchy on moorland and along cliffs, so never treat the phone as your only navigation.

If you have a heart condition, joint trouble or you are returning from injury, have a word with your GP before committing to long days, and build up with shorter walks first.

Your first trail weekend: a plan you can copy

1. Pick a two-day section of 25 to 30 km on moderate ground, ideally between two stations.
2. Check the transport timetable for the actual dates, including the Sunday.
3. Book one base for two nights, or two nights' beds if you are walking point to point.
4. Plan each day at 12 to 14 km with an hour of slack, and note a bail-out point on the map.
5. Walk it, then write down what you would change: distance, pack weight, lunch stop, boot choice.

That last step matters more than any guidebook. Your second National Trail section will be better planned, better paced and considerably more enjoyable than the first, and by the third you will have stopped thinking of yourself as a beginner at all.

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