er... i don't find it that simple.
the fronts not so bad, but the rear can be a pain.
1st of all (after you've removed the wheel of course) you have to break the bead. thats just the thick bit of the tyre that seals up against the rim. this bit is almost impossible without some sort of bead breaker, and if your going to attempt it, be careful not to damage your rim.
next you've got to lever it off. the alloys (R1200GS) are not so bad as they have a thin edge, but they are easier to scratch. the spoke ones have a thick bit where the ends of the spokes go and that makes it more difficult to lever the tyre over.
if your going to have a go, use some blocks to rest the wheel on to save your rim getting damaged on the floor, and plenty of washing up liquid to help the tyre off. don't be fooled into thinking you can do it with small tyre levers, mine are 18 inch.
i do my own, but i hate doing it. i don't have them balanced either, but have never had a problem with that.
the first time you do it, it'll take you longer than you think. trust me.