I always test fit the whole thing. Then I remove all the parts before finishing.
I also counter-sink all the holes a little before finishing. This helps prevent the finish from cracking when the screws are inserted.
There are no drills that will damage lacewood, or any other wood for that matter as long as they're not mis-used. Then any drill is capable of damaging and wood!
Replacement Wide Range Humbuckers and modifications. Yes, we've got the CuNiFe