You don't need to do it the old fashion way use letter bomb and it funny I just modded mine a week ago i'll save you an hour http://wiihomebrew.me/how-to-hack-any-wii-4-3-part-1/ hope you know how to follow instructions Credit : Homebrewpriate Tools: SD card at least 2GB USB Recommended at least 16 GB (more memory. More games) Decent Computer Cl0ne
Letterbomb is probably the easiest way to do it now. http://wiibrew.org/wiki/LetterBomb click downloads and grab the files for 4.3e then follow the 6 easy steps and you are set.
What about ModMii? I used that to do mine. And I actually did 3 of them on 4.1 4.2 and 4.3u. Letterbomb is good too. Please make sure you make backups as this is why I did 3 softmods due to bricking the system.
When you have done the letter bomb exploit, Make sure you get pimp my wii homebrew app. That program updates every file so that you can play every backup without any problems,