The fitting started well. All is OK and the instructions clearly point out what to do when. Having two people helps enormously - one can put parts together while the other dismantles. I was also fortunate in that my car was 15 months old - none of the bolts were that tight, especially on the manifold. However, make sure you have a good comprehensive toolkit.
Installation is a matter of following the instructions.
When first installed, it remained slack. We had to cut this in half, mounting the throttle in-between the two sections to get a good quality cable connection. The idler pulley - this is the big one, and the place where the instructions fall down. It doesn't work. The diagrams generally refer to a pulley system which uses two pulleys and includes the brackets to make this work.