often when im jerking off I think to myself, 'im so horny right now i would love to eat my own cum' and then after i finish the desire goes away almost instantly
We've discussed this here before in at least one thread and as I recall, most guys, including me, have the same desire to do it at some point, but also have the same reaction.
Several years ago, though it was a challenge, I was able to lay in bed and put my legs over my head so my feet were on the wall and my cock was above my mouth. But because I wasn't as flexible as I used to be, it was very uncomfortable and very difficult to make myself climax. Eventually I was able to though, but because my climaxes feel better when I keep stroking through them, I ended up flinging most of the cum everywhere except for my mouth. So it wasn't too successful.
I finally succeeded by cumming on a cracker then quickly putting it in my mouth, but had on several occassions tried it, both with and without food, but was not able to. No matter how horny, aroused, excited I was before and during my masturbation, the instant I came it was like someone threw a switch and not only turned the desire off, but even made it seem disgusting. (Which is kind of funny in a way, because most girls seemed to indicate that if we expect them to down it, we should be abe to...)
As far as what to expect, every guys cum is different (from what I've read, never tried anyone else's). In general expect warm and thick, my is rather salty.
Good luck. Let us know if you succeed, and if so, how.