I allow time before training for attending to the details that are only missed if they're not done. Here's what I do before each training session:
plan the new workout (the night before)
make sure upstairs and downstairs heaters are off
quick clean bathroom, in case it gets used
get water bottle in case clients forgets to bring some
make sure iPod is ready to go
review workout one more time
And I'm spending at least an hour, and sometimes more, immersed in training books, articles, and newsletters. While I can't get experience in any way other than hands-on training, I can certainly be the best educated, most up-t0-date trainer there is -- THAT is within my grasp!