i've taken the GMAT. It's really not that bad. I had been out of college for a few years when I took it. I didn't even bother to study at all and I passed everything just fine. The hardest part was probably some of the math. The only reason I say that is because I hadn't touched some trig and calc since highschool. Obviously I was a little rusty.
As for the computerized version of the test - you should be fine. That is, unless you are electronically declined. I definitely wouldn't recommend taking any paper test.