[bastil]

Another option without the computer is to highlight a collection's name and press right on the d-pad. Then select Add/Remove Items and you can just go through your books and press once to add/remove them from the collection.

Yeah, I like this one, I just thought about a way that would include less back and forth work on the Kindle.

Or you could just use the plug-in within Calibre that let's you manage your Collections. I have found it to be easy and is updated on a regular basis.

I have to admit I never used this plug-in so far. Which one is it?

I think you'll find it won't work quite the same way with non-Amazon books as the code you are using is not always embedded in the title of the book (for non-Amazon its an SHA1 hash code of the path on the Kindle).

Ok, I checked them and it doesn't seem to be hash codes - at least not of the actual book files on the Kindle. I checked the hash codes for example calibre books I put in collections but they did not resemble the ones listed in the .json file...

Anyway... looks like you've put some thought and effort into this tutorial. I hope your process makes someone's life a little easier.

I hope so too