[Eric Pas] “1)I am working on some large project. Should I wait until I am done with them? Or should it be fine while upgrading from CS6 to CC?”
I would wait. CS6 is now five generations behind the current version and nothing would spoil your move-up to CC more than to have issues with a CS6 project. I have done it, quite successfully, for older stuff that needs to be revisited, but I wouldn’t want the stress of getting the cut out the door whilst having to do a significant upgrade of the NLE.