[JimmXinu]

@duska3419:

1. No, there isn't a guide as such. If somebody wants to write one, I'll link to it or include it in the GitHub, but my experience is that I'm terrible at writing instructions for software I've written. One resource I point people to frequently is the defaults.ini file that contains tons of comments on different options.
2. You can use the 'Get Story URLs from Web Page' feature with your AO3 bookmarks link. I don't know of any way to get a reading history from AO3.
   
   FYI, refer to the FAQ about 'don't update your whole library' for why it's a bad idea to do large numbers of downloads all at once. I don't recommend more than 20-30 at a time and space those batches out.
   
   I will also recommend creating a long-text custom column for Saved FFF Metadata (see bottom of FFF's Custom Columns tab) before downloading lots of stuff as it will save you more downloads when you inevitably want to change your columns, etc.
3. To use the FFF update from email feature with Gmail, you have to turn on an option in Gmail that is called 'Allow less secure access' (or words to that effect). If you don't understand it well enough to evaluate if the loosened security is worth the trade off, I don't recommend using it.