There is no real one way of doing it. What one person loves another may not! Go with the moans and body language. If they are moaning then you know they are liking it, if not try something else...better yet ask your partner if they like what you are doing...some guys get very turned on by having their girl ask them if they like that while staring into their eyes!
I know my guy loves different bjs all the time, I like to change it up. I have been know to just start licking his balls in his sleep...instant wake up! : )