That's not good. You'll have to wear protection. I don't know what you're actually doing but I try not to use angle grinders for cutting. I use a reciprocating saw and palm sander for smoothing. The high speed stuff makes the job nasty even for guys with experience. I work with the stuff daily and you've got me scratching. PM me anytime for advice, I'll help where I can.
A guy I knew was on vacation and went to visit his buddies at the yacht basin. They put him to work on a boat but he was in shorts and sandals and ended up spending a week in the hospital. Nice friends!.