Nervous to give my first BJ

Sa
For one, my current boyfriend is the first and only person Ive had any sexual relations with, and he has had experience in the past. And I don't like doing things that I have no experience in. 
I'm nervous to give my first blow job. By no means is he pressuring me, but I feel like it's time to go ahead and return the favor. 
Were you nervous before the first time you gave a blow job? How did you get over it?How long did your first blow job last? Did you spit or swallow?