I walked the Two Moors Way a few years ago now and didn't really have a problem. I used the James Roberts guide which helps where the path might be ambiguous, although when I went there had obviously been a change of route at some point that hadn't made either the guide or the OS map. I assume it's now fixed but just in case it's between some houses a few hundred yards after Great Hele Farm, and not as marked on my map, adjacent to some woodland. That really messed me up although it probably shouldn't have because I believe the footpath did have the TMW sign on a signpost.
Things have also changed since I did it, in that I understand it's now a complete coast to coast walk, whereas when I walked it the start point was Ivybridge.
I would recommend getting one of the guides (there's a choice on Amazon) since they do give useful information although if you use it for accommodation it might be worth phoning ahead. We had a issue with one pub (with rooms) that was supposed to have camping outside. We thought great, if the rooms are all booked we'll put the tent up outside, but no, the Inn had just been taken over by new people who had ripped out the rooms for refurbishment and declared that the camping was an insurance issue so we couldn't put the tent up in the garden.