The offside engine mount bracket can be a pain in the **** to get out, so takes a bit of fiddling.
The correct way of doing it is to lock the cams in place with a pin in each pulley and to then slack the 3 bolts on each pulley. This allows the cam sprocket to turn while keeping the cam in the correct position. This is to allow an even spread of tension on the belt when tensioning. The 3 bolts are then re-tightened.
Otherwise you can get away with the old tippex method, just makes sure the belt is taught between the pulleys on the non-tension side.
Everything else is pretty straight forward and remember, if there is new bolts/studs in the kit USE THEM!