I fell all the time when I first got rollers but after a few sessions it becomes second nature and I can even ride up to them and hope on. Also it helps if you get to the point where you can ride with no hand so you can eat some food for the long rides.
The best tip that anyone can give is buy a cheap fan to put in front of you and turn it on "high". That way you won't overheat/sweat like crazy and you can ride longer. Put on some "Beachboys" and a bright light and it feels like your riding on the Califonia coast!
