Forks over Knives is a great documentary with a base of the China Study featuring the researchers.
I have been a vegetarian since 2011 after watching the documentary, haven't made the complete switch to vegan though I eat vegan when I can. WDW for vegans can be hard, however eating vegetarian is fairly simple and they offer vegetarian options nearly everywhere if you decide to go that route before completely switching to vegan. Some places should be able to offer you a vegan alternative, you'd have to ask. Personally I feel much better than I did before, and I do feel even better when I eat vegan. I love it. Good luck!