Im not a trained mechanic, and CVH's were all i ever knew too! Then started getting friends with Zetecs wanting help and so dived in. They are piss easy, just get the locking tool kit (usually made by laser - available from Euro car parts or ebay etc) and be methodic.
If your that worried, mark everything up with tippex first so if you get part way through and think "nope im fucking this up" you still have reference points for the original alignment and can return it to that