I never had a problem with the chesthair itch after trimming. Fuch shaving though, it only buys you a couple days of less maintainence and will probably leave you with lots of ingrown hairs. Speaking of that, after a back wax you should have you SO scrub your back to exfoliate it and keep you from having lots of ugly ingrown hairs, or do it your self with a loofa-on-a-stick. This whole hair maintainence thing is a pain in the ass, but I have to say I like the look much better when it's all done. I've never been able to convince girls that my back hair was related to my extensive testosterone production which made me better in bed!