Use the g35 workshop manual, its available online. I have a copy of the V35 one here too if you are local.
As for the noise, it sounds like a worn bucket, they are a pain to change. You would have to measure the excess lash and add it to the bucket height to obtain the size for a new bucket. (from Nissan)
The guides when they wear cause a rattly chain noise, not a tick, is it once each engine revolution approximately?
Where are you located?