Ive walked a fair bit of the path, not in one go, but over a seven year period, and the path has never really been in doubt, even though it goes through some remote areas, especially in the Shropshire hills.
When living in Cardiff, i joined several organised walks along the path, from Chepstow as far as Monmouth.
I also visited the Kington and Prestigne areas, numerous times, visiting Llanfair Hill near Clun, about four times, as this has the best sections of the Dyke.
The way marking for this very popular LDW, is excellent, as long as one has the relevant mapping for your location.
A few years ago, i started from the Prestatyn end, but work commitments put pay to any further adventures.
The numerous guides for the entire walk, give a clear explanation of the route taken, and ive never lost my direction, even when in the remote hills above Clun.
Carry the essential mapping, and follow the well signed direction signs along the route, and the Offas Dyke Path is a great adventure.
I read recently, that significant deliberate damage has been caused to the Dyke, in the Llanfair Hill area, enough damage, to cause real concern.