> What do you do to minimize irritants like uneven margins and wonky viewing angles?
My favorite solution: CamScanner. It's one of the apps I use most on my Android phone, and is available on iOS too. There's a free version and a Pro version for $5. I don't know the differences offhand, but I bought the Pro version without a second thought after trying the free one.
It autodetects the edges of your document and crops and deskews it, and then enhances the color/brightness/contrast for readability. It will do this automatically or you can adjust the cropping and enhancement manually.
For more intensive cleaning up of scans (either from a camera or a scanner), there's a wonderful open source app called Scan Tailor:
http://scantailor.org/
A few months ago I scanned an old manual for the SIMPL (Systems IMPLementation) language we developed and used at Tymshare in the '70s. It was a photocopy of an original manual with most of the pages skewed a bit one way or the other, and dark speckles all over the place.
I cut off the binding (lucky for me it was Velobind so I just cut off the back strip with a knife and had it re-bound at Kinko's when done) and ran the pages through my Brother MFC-9070cdw at 600 dpi. Scan Tailor took the page images and deskewed them, removed the speckles and generally cleaned things up. There were one or two pages where I made some manual adjustments - and also I turned off the feature where it zooms the page to fit just the text on it since I wanted the text to be the same size on all pages. Other than that I just let it do its thing and the result was pretty nice - the PDF looks much better than the original manual!