Steve gave you the how-to on that one. At this point you have to remove the rockers, which will keep all valves closed as the crank and cams turn. Once you roll the crank to zero, then you can remove the cam sprockets and turn the cams independently of each other till all marks line up. Replace the cam sprockets and rockers and you should be good to go.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.