Awkward. I had no clue what to do, no technique at all, just me bobbing up and down on his shaft, finally ended with me licking the head while I stroked him. I still couldn't get him to cum. We were both frustrated and I never got a second chance with him.
The second guy I was with went much better. He was very accommodating, talked me through it, told me what he liked, encouraging. I was happy when I made him cum, although I did gag and choke, when he came. I had to spit it out, wasn't ready for the taste. I have grown to like it since though.