One tool I always have on the truck is a very coarse wood file, half round. It can eat away material quickly, just make sure to push downward on veneered surfaces! This way I cut my box holes tight, and can open them up a bit if need be. The round side is great for those riser holes that are a tad off.
I use the blue tape too, only I put it on my jig saw shoe instead of on the cabinet
