As others have said, if you're not intimidated, go for it. A couple pieces of advice from a recent all-grain convert:
1) It definitely takes longer, especially the first time. Plan for 3 or 4 extra hours over an extract brew, although you will be able to cut that down once you get the hang of it.
2) Don't try a crazy mash procedure your first time. Aim for a middle-of-the-road mash temp (say, 154 F).Your first time with the all-grain equipment you're almost certain to be off by a few degrees. Make notes, and have hot and cold water handy to correct.