Hmmm ... 8GB is the bare minimum of RAM to run CC. You'll need to make sure you don't have any other programs open while you're running the Adobe programs.
It would be a good idea to run the Scanner Tool at crucial.com and see if you can add more RAM.
Brian always says that you should have at least 1/3rd hard drive space free, and you're a bit under that. Your drive is sufficiently big so it shouldn't matter, but don't let it get any more full.
And you should definitely run CleanMyMac straight away, and every month hereafter.
Also - VERY important - make sure you don't have ANYTHING on the desktop. No files, no folders. Desktop clutter slows a computer significantly, Brian says.