It might be kinda backwards, but you could try starting at the WebAIM checklist http://webaim.org/standards/wcag/checklist which kinda grabs what they figure are the most important points of WCAG2 and gives you those point to check against your own sites. You could start there and then in places where you maybe aren’t really meeting that checklist, check that section of the actual WCAG2 for deeping information.
If you have a good document structure, use text where you mean people to read stuff, use decent contrast for that text and users can keyboard over the whole page and reach all the same information, you’ve covered most of the main points. I’d say the checklist helps you find where you’re lacking and then dive into the longer guidelines themselves. The WebAIM checklist also links to the specific sections of WCAG2 as well which is nice… but when you click those, I’d go Foreward and Back to explore the related sections too.