Education and practice. As a new str8 shaver myself I think that it is really helpful to watch all the shaving videos, read all the literature re technique,and keep reading these posts. Lots of helpful info.
Good luck and I also second the idea of keeping the old razor around. After week of str8s I just entered the chin area today and my DEs come in really handy to finish up the job. If you travel and don't want to take the str8 the old razor or a DE might be nice.