I did much of my shadowing with a CRNA. Don't feel threatend by the ridiculous banter that is exchanged between the CRNA's and the AA's on these sites. Most of the CRNA's are good people and would love to assist you.
If you are experiencing difficulty finding a place to shadow, try some plastic surgeons' offices and out patient surgery centers. These are the types of places where I got my shadowing experience. And don't feel like you need hundreds of hours of shadowing. You need only enough to meat your school's requirement and, most importantly, to know for sure that you want to become and AA. Hope this helps.