How can I snap a duplicated part of a mesh to a hole with the exact size so it forms one whole object again? I am still very much new to Blender, and I've been struggling with this problem for a couple of hours now. It might have been better if i'd just created another project from scratch at this point, but I want to see it through to the end and learn more in the process. Scouring the internet hasn't helped much.

I've been following a tutorial on modeling and composition and made a tea pot. All was fine and dandy until i started working on its handle. After much fiddling I was dissatisfied with the results and decided to delete the handle altogether. This left me with the following situation:



Since it is a round and symmetrical object, my first instinct was to duplicate the corresponding 3x4 side of the pot and just replace the old faces. That's where I got stuck - no matter how i try to snap to the remaining vertices / faces, the duplicated part always becomes deformed since there is nowhere i can snap the middle 2 faces to:



So, is there any kind of way for me to bring this pot back into its original shape, or do I need to start over?
Try to use a Grid Fill option. First select all edges around the hole with Alt+RMB, then press Space and type Grid Fill. If the result isn't as nice as you expected, change it's settings in a Tool Shelf (T).