1. Bring #1 cylinder to TDC.
2. Mark position of CAS
3. Remove CAS, cam cover
4. Remove CAS mounting bracket
5. Mark position of cam belt relative to TDC on cam wheel.
6. Undo cam wheel retaining bolts
7. remove cam wheel - may require some levering and wiggling
8. Insert new cam wheel, aligning its TDC mark with the mark you made on the cam belt
10. You should now be able to put the cam wheel back up onto the camshaft. may need to adjust crank to get the locating dowel to align properly
11. replace camwheel retaining bolts, tighten
12. replace CAS mounting bracket
13. replace cam cover
14. replace CAS, aligning marks.
I think that covers it all. It might be worthwhile to carefully check that all clearances are maintained, ie no bolts sitting out further than they used to, before doing 12 / 13 / 14.
You may also need to get a check done on the timing, it might be a few degs out.