For a pin puller for the guide rails I used a bolt and spacers. This is probably the best way!!! Off the top of my head I believe it's an M5, although it may be an M4. What I did was used a bolt, threaded a nut all the way to the head, used 2 washers sized to the bolt then a hollow steel tube which had an inner diameter larger than the hole drilled in the head for the guide pin. I then used another washer so that the narrow walled tube would not dig into the Aluminum head. Then use a wrench to back the nut back down the bolt and viola, instant press, worked like a champ. The bolt I used was about 2-2.5 inches long (in metric speak) and it theaded about 5mm into the pin. more than enough to get a good grip. The bolt should thread into the pin with just your fingers.

I had my rockers off when I did mine. It's probably helpful to remove them so that any possible axial motion will not scar the rocker mating surface either on the rockers or the cam.

Definatly take the tensioner off, it's held on by 2 bolts and not difficult to put back on. This will give you the slack in the chain you will need to avoid a case of turets when trying to get the sprocket back on.

To hold the cam while torquing the center bolt there are 2 ways:

1) Have someone hold the cam with a wrench. Midway on the cam are two rectangular tabs which are for this purpose.

2) Once the sprocket is on the cam and chain is attached, the chain will hold the sprocket/cam while you tigten the bolt to 100Nm