Every part of an Edwards Scissorhands costume seems complex to me, from the wild hair to the scissor hands. Cosplayer Alyson Tabbitha recently put together a costume featuring the Tim Burton character and documented each aspect of the process. She has how-to videos for the wig and make-up and also the most important aspect of the costume: the scissor hands. She goes through the steps in the above video — you can get a full supply list and templates for the hand in the video description on YouTube.
Need a guide for resin casting? Alyson has that, too: