Of course I practiced using a hole saw by drilling through wood. The
plug (the cut out part) gets stuck in the hole saw. I might cut through
1/8" thick aluminum for practice, too.

Will 3/8" thick aluminum get stuck in the hole saw?

Also, for cutting fluid, I have these choices... WD-40, silicon spray,
Teflon spray, and the combination of silicon and Teflon, and 3-1 sewing
machine oil. Or I could go pick up some cutting fluid from Home Depot if
it helps for my 2 cut task.