Originally Posted by SpeshulEd

He's being sarcastic. If you want to remove the tire from the rim, you need to remove the entire wheel from the bike. The axle gets in the way if you don't.

This shouldn't be that difficult, if it is, then you should practice anyway. Put the chain on the smallest cog in the back, take the wheel off, swap tires, put the wheel back on, put the chain back on the small cog, done.