Hi there,
There is no guide as far as i remember but is fairly simple.
1. Making sure engine is off and cool enough to work on, start by taking off the air box (2 bolts and 1 spring keeping it in place.
2. Take off the throttle body to allow easy access to the ICV
3. With some solvent/grease remover spray all over the throttle body cleaning with a cloth (i used cotton buds to reach hard to reach areas)
4. Refit and start car up, should have a clean nice idle after that, if not other underlying issues might be the cause
Sam