If you have 3 motion pro levers you can do a rear easy with out a stand like this guy does but with the tire on the ground with you knees holding it down. The front can also be done this way but you will want to remove the rotor on one side. Breaking the bead is the hard part with out a stand but I have seen it done on a motard tire and rim just by standing on it.
http://www.youtube.com/watch?v=qw0B2gIwbBg
http://www.youtube.com/watch?v=mTata...eature=related