Try giving it a start and let it run for a few minutes, have a feel of the exhaust headers where they come out of the cylinder head (careful now they could be hot!! :eek ), if one of them is cold that is the cylinder with the problem, either HT lead, coil or spark plug. Hope this helps. oh aye, and if you are going to change the plugs get the right ones for the bike.
If you worried about falling off your bike, you'd never get on.