A re-shoot is
always better than fixing it with editing. I learned that the hard way on videos in the past. Now, as soon as I finish filming the first thing I do is watch through the clips in full resolution on my computer, before I even copy them onto my hard drive.
Also, colour correction is better pre-production than post-production, you preserve shadows, highlights and lowlights better. Most cameras have colour correction built in, make sure to tweak those settings.
If you don't have a tripod, zoom out a little bit before shooting, so when you stabilize the footage you can zoom in and hide the ugly edges. A table or even a surface to lean on is very helpful when you don't have a tripod.
Don't expect to enlarge the footage in the editor. You obviously loose sharpness and makes the footage look amateur in some ways (only for excessive zooming). Try your best to do as much zooming (optical zoom, not digital) while shooting. A little bit of zooming in the editor is fine, just make sure it does not look pixelated. On a side note, the new galaxy note 3 can do
full 4k video @30FPS, meaning 3840 x2160. I guess you could zoom into footage shot with this, since you will have to zoom a bit before your resolution dips below 1080p
Make sure your lighting is consistent. Especially if you are using effects, good, consistent lighting will ensure they look good. Re-shoot for better lighting, don't try to add lighting in the editor, it is not as good.
That's all I got. This is from experience, and its always better to learn from others' mistakes than your own
