Does the aux belt require timing as complex as the cambelt? Or does it just get tensioned?Its not too hard.
BUT when you do it you need to use a NEW Aux belt and better yet the full kit (around £60)
If the belt is reused it may snap, and if it snaps there is a 80% change the cambelt will eat it and then its a 100% chance its Bye Bye engine.
Takes about 2 hours at the most.