Kirikiri is easy to get started with.
Step 1) Grab Kikiriki from here:
You must be registered to see the links
; the page also has how to use it.
Step 2) Unpack the patch.xp3 file (and/or data.xp3, but I think patch.xp3 overrides every script at this stage; if you can't find something in patch.xp3, look in data.xp3)
Step 3) Edit the files that come out with a text editor and put in your translations - be careful with lower case characters though, because if you don't edit some of the scripts, lower case English characters control color. There may also be issues with spaces in names, but I'm not sure.
Step 4) Put all the files you edited into a folder and pack that using Kikiriki to patch2.xp3.
And done.
However, as I said, the main reason no-one's done much on this game is that it is a lot of work. As mentioned, you may end up having to reprogram bits of it to handle lower case and/or spaces in names, and if you do then you'll have to modify every file to obey the new conventions. So there's certainly an argument that you'd need to program some simple tools to do a good job on this. But no reverse-engineering should be required.
As I've previously stated, if no-one else tackles this, and I actually implement things into RPGMaker Trans, I will probably do a partial for this at some point. But that won't be for a while yet.