>You can practice this by riding off curbs. When starting make sure the curb is regular, with a flat surface all the way to the edge and then a straight drop. The street should be fairly level at the base of the curb. You can work on
>trickier curbs later.
>
>To ride off the curb, approach it at a relaxed but even pace. Ride off the
>edge, and be ready for the unicycle to drop a bit underneath your seat.
>You will want to land with your weight on the pedals, which reduces pain and
>lets your legs act as shock absorbers. Start moving when you land and
>settle back down on the unicycle.
>
>If you don't want to think a whole lot, just go try it and see what happens.
>It may be easier than you expect.
I would add that it helps if you hold the front of the seat and pull it up into your backside with one hand. Also you can adjust the angle of approach to the curb so that you arive with your pedals in the ideal position (horizontal). You might like to try "jumping" slightly off the curb rather than droping off.
Mark