Hey Mike,
No easy way to turn back the clock, so to speak, without getting into the CSS.
The simplest way to check what you currently have against the original theme stylesheet is to upload both into diffchecker.com and it will highlight any differences. Should give you an idea if there’s something in there you didn’t mean to do. 🙂
Since you’re wanting to tackle customizations yourself, you might enjoy some basic CSS courses to get you comfortable. And you might even start to have fun… Here are a couple of suggestions:
http://www.codecademy.com/ (free)
http://www.lynda.com (paid, but that links to a free 7 day trial)
If you don’t care a hill of beans about it, the next simplest thing would be to tweet using the #genesiswp or head over to the Google+ Genesis community forum and see if you can buy an hour or two from somebody to just take care of it for you. If you go that route, cc: me on it so I can help spread the word.
Cheers,
Carrie