I did make it myself, and it's really fun to run around in. At the anime con, a lot of people took my picture (it's handy to have brown hair/blue eyes naturally). But my keyblade finally broke so it's not in this picture.
Sewing can be difficult, but it's really just a few simple steps all piled on top of one another. Take your time, and make sure you've got a good sewing machine!