2011 iMac (high-end) taken apart, how to reassemble? Well, this is awkward.

I set about disassembling my iMac in attempt to fix a problem, and the problem is fixed, but now I'm not quite sure how to put it back together.

Does anyone know where I can find a guide on how to put it back together?

Do you think Apple repairs (store &amp; authorized dealers) will take my iMac and put it back together if I asked them to? (Out of my pocket of course, my warranty expired)
Nothing is better than iFixit replacement guides (link for your 27 inch 2011 model). This tutorials are technically correct and safe to apply. Hi-res pictures are also available. Additonally you can try to find some videos in Youtube