I've got a backup of Monster Hunter 3 (JAP) lying around but have no idea on how to get it running on my PAL Wii. From what I could gather by searching these forums and youtube, I know the following:

I need to get my Wii firmware down to 3.2.
I need to install the Homebrew Channel.
I need some sort of .wad to fix the issue you get when starting a new game or something.

Unfortunately, I don't know if that's all there is to it. Even worse is that I don't really know how to do any of the above. My problem is mainly the following:

Downgrading my Wii (PAL) and installing the Homebrew Channel both seem to assume you're using the Twilight Hack. Now the thing is, I always thought that's just for people who didn't hardmod their Wii. Mine is modded with a Wiikey (one of the earliest). Is there a simpler way for me to get the homebrew channel on my wii?

I wish there was some comprehensive guide starting at square one. Any help you can give me is very much appreciated. Please keep in mind that I've been out of the scene for a long time and might not know all the new jargon and/or methods that have been developed.

Thanks very much in advance!