theres loads of ways to do it depending on if your camping out or staying in b&bs. you can hump your own kit or pay someone else to carry it. you can do it in 3,4 or 5 days which will influence where you stay.
tbh you start of in a shithole,end in a shithole and spend days wandering underneath some of scotlands greatest mountain country with hundreds of other people along a muddy path.you could find a lot more interesting things to do but obviously people know what the whw is so maybe easier to get sponsorship. i did with mates but binned the last day to head from kinlochleven over the mamores into glen nevis.
you get very reasonably priced guidebooks, check out amazon