I probably could have gotten a smaller set of tools, but for a few bucks more, what the heck.  I easily took out 2 links in my watch within minutes using that grey think, one of the little "pick" (?) tools, and the hammer.  NO idea what some of the other tools do so I'll have to do some research.  Would have been nice if the set came in a plastic box or something other than a plastic bag, but it was really inexpensive and I did it myself.