Don't shave your pitts with a razor imo. The itch isn't worth it and fishing an ingrown hair out of a giant zit in your armpit with a sewing needle is no way to spend your saturday night. Use clippers there, but leave a little room between the cutting blades or you'll snag some skin.
GetRowdy shaved for MGB 1 and ended up in hospital with 100s of ingrown hairs, or so he said. He looks like a naturally hairy bastard tho, possibly Mediterranean descent. I can't help you with first hand advice on bodyhair since I have a minimum, except to say that shaved legs on a guy look peculiar imo.
Nose hair is best dealt with by a wax that sets rock hard, applied with a Qtip to a dry, talcum powdered nostril & pulled with tweezers. Yes. Yes I do.
Hope this woman likes you for more than just your physique and vice versa.