If your guitar is a fine one, like a Martin or a Gibson or any other that is likely to appreciate in value (as good a criterion as any) don't try these repairs yourself unless you are sure it is something that can be fixed easily if you make a mistake. There are so many fine instruments (my 1933 Gibson L-00 is one of them) that went through a period when they were worth next to nothing and home crafters nearly ruined them. A friend of mine says that you can't really own a fine instrument; You're just taking care of it for the next generation. I think there's something to that.

Chet W.