Well, seeing as this is your first post, welcome!!
Have you ever picked locks before? Personally, lockpicking is much more fun than bumping, as bumping is so easy an 11 yr old girl could do it.
Why do you need all of those bumpkeys? Can you post a pic of the locks you have to practice on?
We here on LP101 are mostly lock pickers, and tend to gravitate away from bumping for the most part.
Unbreakable