You have to TDC the engine, remove the cam cover and the camshafts, doing so requires removal of the cambelt and so you will have to correctly time the engine afterwards, which unless you are 100% compentent doing, then don't even attempt it as you will ruin your engine.

Also things like cam caps have to be tightened to a specific torque which requires a torque wrench.

I believe you may need a "bearing removal tool" as well?

Also you will need new gaskets, i.e. cam cover, "Half moon seals" etc.

Martin