Yea, ive been doing the practicing, and the more I do it I'm expecting it to be less of a problem. Also, i have to say, I think I need to not do these damn Magnum. I need XL, because with these practice runs I get rings and it feels a bit uncomfortable. Its not hurting my erection so much, though - so maybe there some anxiety, and also mood-stopping that is playing apart in the intercourse and condom situation.
If it comes a long naturally or whatever, or like some suggested the girl put it on, done earlier, and just doesn't seem to ruin the flow of the experience I have a feeling I wont have this problem anymore.