Being a Pro/E user you must already know how to model, so your biggest transition might well be learning the different terminology that SWX uses vs. Pro/E. The SWX tutorials are superb, but they are geared for beginners. You should go through them to learn the SWX way of doing things. You should be able to blow through them very, very quickly and it will dramatically reduce your frustration with the transition.
BTW, I used to be a Pro/E user and every person I know personally that has used both say that SWX is so much more intuitive than Pro/E, plus there are more ways to do something. You don't hear the argument anymore that Pro/E can do this or that and SWX can't, mostly because there was hardly anything that SWX could not do that Pro could. Sometimes you might have had to take more steps to do it, but you could still get it done. Either that or it was for some inane feature that few people ever needed anyway.
- - -Updraft