Just a few extra notes:
The power steering reservoir doesn’t need to be removed completely, just remove the bracket fixing bolts and pull it to one side to give access to removing the CPS unit. Once the unit is removed the O-ring just slides over the gear at the end, no need to disassemble the unit in any way.
Unfortunately you will need to remove the rad top hose to remove the cam covers and the small coolant hose near the CPS. What is important before removing the CPS is that the crankshaft is at top dead centre and the cam timing pulley’s are lined up with their markings on the rear cam cover. You can do this by looking through the oil filler hole and at the position of the cam, but I prefer to remove the cam cover just to make sure.
When refitting the unit make sure you line up the hole and the grove as stated in the instruction. One problem I did find is when you inset the CPS the gear engages with the gear on the camshaft which causes the CPS shaft to move, this is why you will need to check the timing when you have finished.