Good stuff, I find the easiest way is to find a roundabout, a large traffic circle. Hit it up early when no one is around. Go around, slowly pick the pace up, slowly get yourself over, ie one buttcheek on the seat, one off. All the while getting your knee closer, and closer to the tarmac.
Suddenly, <SCRAPE>, you abruptly pull your knee up realizing you've just scraped your puck. You pull over to check out your good fortune, maybe even take a phone pic to send to your friends/Myspace, lollz. Get back out there and continue until it's comfortable... I did this over a decade ago near Bear Mountain, NY on a huge roundabout at 6am with my former SillyHawk. After a bit it's easy, best left to the track though...