oral tips

I'm a beginner when it comes to oral...only tried to give head one other time. I feel really insecure about giving head, but at the same time I want to do it to pleasure my bf. I have a small mouth and gag reflex so it's not an easy task for me.

what tips do you have that seem to work really well? do you focus on going deep inside your mouth or just focus on the tip? any advice would be greatly appreciated!!!!!