This is definitely TMI. sorry guys but I need some tips lol

Ok so is there any woman on here dating or married to a man that's uncircumcised. My bf is uncircumcised and he always wants me to go down on him but I dont know how to do it correctly being to the extra skin being around his d..also sometimes I get gross out lol but I try not to think about the extra skin. How do you ladies do it? Do you pull his skin back and suck or do you just put your whole mouth around it?