First - Put the rollers in a doorway.
Second - Try to relax and not look at the front wheel.
Third - Time and practice.
I have not spent a lot of time on mine, but after being on them for a while I was getting more comfortable. I have heard of people actually playing video games while on rollers. That is a long time with no hands on the bars. I am sure I would crash (fall).
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2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun