I'm in the same boat, but I'm taking the Series 7 next Tuesday. Yikes. I've been putting it off because I feel like I'll never know it all!
I took the 63 and 65 combined, and found it very manageable. I was an engineer with ZERO experience with this stuff, and only studied about 2 weeks, and still passed it. You can do it too!!
Good luck,
~B