Drilling holes seems like such an easy thing to do until you get yourself into a weird spot, or need something to be ultra precise for that clean fit. And because so many holes that we drill in project cars are the same size, we always seem to wear out just a couple of drill bits and therefor never have a great one when you need it. When it is time to precisely cut the holes for some gauges, a fitting, or an intersecting tube, you never have a hole saw that is perfectly round and capable of making that hole look finished when done.
Such is not the case if you have a Rotabroach or RotaCut hole cutting set. There are other brands out there as well, but searching for these will get you most all of them. I don’t own a set. But I will soon, because I know that the latest project we’ve got going on is going to need them and being precise will save time and energy trying to clean up a problem. Good tools cost money, but save you more time and money than they cost.
Your last line sums it all up harbor freight or princess auto are okay for tools that might fall in the river or to loan to idiots , but a quality job demands quality tools .