Yes, it’s safe to mow your arms, but since it’ll feel stubbly as it grows back, save it for emergencies (like that unexpected special date) when you don’t have time to bleach or get a wax job. Be sure to de-fuzz on the day of the event (you don’t want prickly regrowth injuring your date), using shaving cream and a new razor.

Another way to go is bleaching. Pick up a jar of Jolen bleach from the drugstore and follow the directions to the letter! You'll still be hairy, but it won't show up as much!