The required files for BootMii can be downloaded using ModMii from the second download page.Yes sounds like a very good idea! My other Wii doesn't have bootmii as boot2 though so will have to look into how to do a nand backup on it as i can't remember.
I think my confidence has been knocked with this as even though I followed everything and did a nand backup it has still gone wrong (and my other Wii has less brick protection which is even scarier!)
Priiloader, HackMii Installer and MMM can be downloaded from that page as well.
As for the recommended latest cIOSes, cMIOS and DML can be downloaded from fourth page. As for latest BC, that is on the first download page.
@Homebrew Ninja: use the abstinence wizard, if you wish to have an emulated NAND (using neek) without the need of changing anything on your actual NAND.