[freakray]

To sand off the excess after removing from the fret, I use a sanding stick or on thicker parts I sometimes use a needle file.

Any clear coat type paint will work to attach scripts and the like, for most other times, super glue(CA) is your best bet.

Bending is tricky, I wouldn't use a ruler alone though, you may want to look into either getting an etch mate bending tool or emulate it somehow.
I place my parts for bending between two pieces of glass, unevenly overlapped so one creates the bend edge and the other a flat surface, I then use a box cutter blade to bend the part towards the guiding edge.

Finger can be removed with some rubbing alcohol, just make sure you clean the parts well to get rid of the skin oils.

Don't forget to prime the parts if they are to be painted, you want the paint to have a good surface to grip to, any metal primer will work well. Personally I use Tamiya primer without any hassle.