While the sidestand (and center stand) trick works well, be very careful about NOT putting the rotor side down on the ground when you start - especially if you have a newer KTM with the free floating rotors. You can put the sprocket side down or even better pop the sproket off and put the hub on the ground. Cardboard or a shop towel can help keep it clean in the process (if you're trailside).
The video above is done correctly.
2010 KTM 990 Adventure
2010 KTM 450 EXC