I fixed my drysuit wrist seal myself... it wasn't too hard, though I did get some glue smudges on the sleeve.
Here's an ankle kit from the same store I ordered my wrist kit from:
http://www.coloradokayak.com/Ankle-Gasket-Kit You basically tear off the old seal, put a cylindrical object (like a wide can) in the sleeve with a snug fit, and then glue the new seal onto the sleeve. I only used my drysuit once after the repair, and it seems okay.