As Gav says...no need to touch the exhaust. You need a 6mm allen key for the two starter bolts and a couple of long extension bars (1/2" sq. drive). Have a look on RAVE, it gives the lowdown on how to do it.
The top bolt is a pig because you are working blind, but undo and remove that first, otherwise if you remove the bottom first the weight of the motor will be hanging of the top one and make the top one a bit more of a lengthy job.