If you ride on rollers, you will eventually fall, so keep that in mind when you are choosing where to set them up, don’t place them next to your fish tank or flat screen tv.
Keep a steady rhythm, and balance yourself with your backside (sounds weird, but you’ll figure out what I mean). When riding on rollers, pay attention to their sound. Rollers are the greatest tool to perfect your pedal stroke, you don’t want to hear rollers go “whir, whir, whir” with each pedal stroke, you want to here a perpetual “whhhhhiiiiirrrrrr” which you get when you turn the pedals instead of stepping on them.
Have fun.