Cam belt is doable but a real pain in the **** when the engine is in the car. My engine was out and I tried to do the cam belt myself, didn't buy the full kit just a new cam belt. When I fitted the new belt using the old pulleys, it was about half a tooth out on one cam. When I put it back in the car the engine ran but was very lumpy and luckily it didn't cause any damage, ended up getting the belt replaced by a specialist. Cost me £300 all in, the whole cambelt kit and fitting.