I blv that the first couple of times shud be done under the supervision of a therapist/doctor and accordingly find out what strengths u can use at home. Please don't put on anything on u're skin unless a doctor has seen it..
It's best to get it done at the clinic as they know exactly how long to keep it on for, what sort of peel u need (lactic, glycolic, salicylic) and the concerned area's.