How should I schedule laser hair removal for my underarms and legs? lol

I've been regularly removing hair by plucking with tweezers and shaving, but it always left cuts and severe irritation on my skin, causing my pores to turn dark. It looks like tiny black dots stuck in my skin, and it's such a hassle every time I shower, so I'm looking into hair removal treatments at a dermatology clinic. Lately, everyone seems to be signing up for laser hair removal packages of 5 or 10 sessions for permanent removal. Even though my hair is thick and dense, is it possible to get rid of it cleanly? I'd like to know how often I need to visit the clinic regularly to ensure the effects last a long time. I'm also really scared and worried about whether the treatment is hot or painful. I want to ditch the razor and feel confident, so please give me some tips and advice!