Are there any tools for editing descriptions around or is this a hex editor kind of thing?
Hex editing descriptions sucks hardcore since so much of the text is compressed, but unfortunately that same compression makes it hard to get a comprehensive editor up and running smoothly.
The "easy" way to do it right now is to find the exact piece of text you want to edit, force the ROM to recognize it as a snippet of uncompressed text, and type it in that way.
Read this: http://www.romhacking.net/forum/index.php?topic=13352.0 (http://www.romhacking.net/forum/index.php?topic=13352.0)
That's the method I was using way back when. Inefficient but it works. :/
EDIT. Third post is where Edea goes over it.
LOL!
I just looked at the formatting and everything. Wow. That's ridiculous.
Am I missing anything important by not seeing Edea's pictures? Says they were moved or deleted.
I think they were just screenshots proving the method worked. Visual guides aren't very useful for hex editing either way so I wouldn't worry about it.