Gentle is the key. It's really sensitive tissue, and can tear easily, or be painful. Time is not of the essence.
Lots of lube.
Relaxation.
Communication.
Sexualization.
It can be very pleasurable, but w/o important above listed components, it can be a lesser more uncomfortable experience.
Ask questions. It is your best method of sussing out what you don't want. Make a list?
Find someone who listens.