When I replaced mine I also fitted the later additional reinforcement plate and new gaskets are essential as the old ones will disintegrate when you remove the old mounts. Otherwise it is quite an easy job - it took nephew and me less than 1.5 hrs to do both sides.
this way you you dont need to remove shock from car. undo top mount, jack the car up with wheels on and pull the shock down, remove and replace top mount then push back in place.
Was a lot easier than i thought it was going to be.