If you dont remove the 4 airbox fixing screws before you try to remove it!!!
There's also an oil breather pipe that connects to the airbox that you'll need to pull out.
You'll need to remove the seat to get good access to the tank fixing bolt at the back of the tank.
It is a pretty straightforward job, just give yourself 1/2 hour or so, follow Weeksy's directions, read the manual first and give it a go.
Also, when you're putting the tank back on, be sure to put a dab of grease around the o-rings on the fuel union connectors, this'll reduce the risk of damaging these o-rings.
Good luck
Tim