Oral sex help

Hi,

I have never received nor given ora sex and tomorrow my partner and I are planning to

I've read about STI's and saw that if there is a cut on your mouth and such it's possible to get HIVS ... my partner and I have not had any past partners or sexual experiences.

On the corners of my mouth it's a bit dry and in the morning there's a small cut... but not too big. Because it's so cold at the moment :(

Is this something that could limit us from continuing ?

Just wanted some advice from your first experiences and if there is a possibility