Self-guided, guided, or neither
Three different ways to walk the same trail, at three different price points and levels of hand-holding.
Fully independent: no operator at all
The trail is free, public, and well waymarked with the National Trail acorn symbol — nothing stops you booking your own accommodation directly and carrying your own bag. This is the cheapest option by a wide margin, and gives you full control over your daily mileage, but means doing your own research into each night's booking availability, particularly in the smaller central villages, and carrying a heavier pack over the crags section.
Self-guided with baggage transfer
The middle option, and the one most first-time thru-hikers choose: a company like Macs Adventure, Contours Holidays, Celtic Trails, or a dedicated baggage-only service like Sherpa Van or Hadrian's Haul, pre-books your accommodation and moves your main bag between stops each day, but you walk unescorted at your own pace with route notes rather than a guide. You get the logistics handled without paying for a guide you may not need on a well-waymarked trail.
Fully guided
Companies including HF Holidays (operating walking holidays since 1913) and Hillwalk Tours offer guided options with a leader walking the route alongside the group, at a higher price point than self-guided packages. This suits walkers who want route-finding, pacing, and historical commentary handled for them, or who prefer walking as part of a small group rather than solo or as a couple.
What decides it for most people
If you're comfortable navigating with a map or GPS and want the lowest cost, go independent. If you want the accommodation and bag-carrying logistics solved without paying for a guide, self-guided with baggage transfer is the trail's real default — the volume of operators offering exactly this package reflects that. Choose fully guided specifically if the social, group-walking element or on-the-day historical commentary is worth the premium to you, not simply as a safety margin — the trail itself doesn't require a guide to walk safely in normal conditions.