#1) Shave dry. No cream and no water. It’s easier and you cut yourself less this way. #2) Shave with the grain. Mine grows in two directions so I shave part in downward strokes and part in upward strokes. Takes about 5 minutes total. In re: armpits, mine are hairy like a monkey and I shave them about once every 3 months with hair clippers. I have found when I shave them I don’t need deodorant. Does it make a difference? If you’re a bodybuilder, yes. If normal joe no, but mine are so unbelievable hairy I’ll always at least trim them.