If one keeps it simple, the job is straight forward - well, at least, you would think so. Two ways of doing it - depending on facilities at your disposal, and the amount of care you want to put into it. I'll go the simple way first, assuming you don't have a lifting hoist - in other words, you're doing the job "on the ground" so to speak, with the help of a good quality trolley jack.
1) Set the sliding disk on top of the distribution valve to the high setting, start the engine to attain...