I would recommend a professional job -- you can quite easily ruin the bow by accident. I won't even take mine to a general shop that does them on the cheap, because they do a lousy job. It's a luthier or a bowmaker for me.

The bow may also need other work, re-arching, for example, and you *definately* don't want to try that on your own.

If you definately want to learn how, I'd start with a cheapie Brazilwood bow and a copy of VIOLIN BOW REHAIR AND REPAIR by H.S. Wake-- but by the time you do that, you might as well have paid a pro.