hi well basically i had some paint work done on me spolier/boot and when i picked the car up they had machine polished the back and it looks mint like brand new

so i was mentioning it to my neighbour that i was going to book it in for a full machine polish, he then said hew had a polisher i could have its just a halfords 240v one but brand new so went and bought some pads there a polishing one and a finishing one and ive got some autoglm super resin polish just wondered if theres a particular way to do it or can a damage my paintwork ect just want it lookking mint any advice?