[DoctorOhh]

Originally Posted by Kore

1. By editing the epub in calibre and changing the settings there. This would require stripping the DRM of the books that have it.

To change the margins this is really your best bet.

Originally Posted by Kore

2. By installing PRS+ and adding a overriding CSS file.

I use this on my 505 and my Son's 300 and have set up 5 different fonts with css that we can change on the fly. A great option for changing fonts of both books with DRM or without DRM.

Originally Posted by Kore

I also have another question... what exactly do people edit in their eBooks?

I remove the DRM from all of my purchased books and run them through calibre to make it easier for my old eyes. I increase the base font and if needed insert spaces between paragraphs and apply an indent to the beginning of each paragraph. This allows me to avoid the need for reading glasses.

Originally Posted by Kore

Is Calibre's convert options only when converting between formats, or is it used to re-format things?

I use it for both, but some formatting can change during conversion / reformatting and you have to proof the books afterwards to make sure they are within the parameters you're comfortable with.

I also use Sigil on occasion to do fine tuning for quick Search and replaces to smooth out wrinkles in the final product.