First thing you have to do is find a driller to trust. Usually, someone can racommend one. Does your center have a
Pro Shop? Ask there.
Secondly, tell the driller what it is you want the ball to do. There are options for every ball. Choose the one that matches what you want.
Thirdly, ask questions. Don't by shy. A good driller will be glad to explain what he is doing, and why.
Make sure, if the option is there, that you get to roll a few frames with the ball, ideally in the same center as the shop. If you have any concerns, fit, span, tightness or whatever, bring it back and show the driller.
The worst thing to happen is that you have a ball that doesn't fit properly, and you don't know why.