The closest I've ever come to cross-country jumping is hopping over low logs in a field, and I'm only just now beginning to grasp the correct fundamentals of flatwork, but I was reading a past issue of Practical Horseman and good old Jim Wofford mentioned that he had a rider rating chart on the PH website.
Of course, my first thought was, "My fans! They need me to share this with them immediately!"
So here you are. The chart is on page 4 of the PDF. I think I score between a 4 and a 5. I haven't jumped a real course for about a year, so who knows where I am with my jumping, but I think I can do all the dressage stuff. I've also never jumped a bank or drop jump, but I can do a 450 pace on a horse I know.
As for horsemanship--performance anxiety, check! I don't know how to drive a trailer either. But I do think I can self-analyze a lot of my mistakes, and I can detect lameness and discern good riding from bad as well as good shoeing from bad (well, I definitely know when I see bad, at least).
Where do you rank yourself?
Moral: Dressage comes FIRST, not last!