Hey, maybe not..
you already have a working homebrewchannel. blue screen with error #002 ?
you just need a different loader, a recent one will have a #002 fix built in. are you loading from harddrive or from discs?
an update to your firmware is completly unneccesary, it will improve nothing or will complicate the things even more. which firmware are you on right now? (systemmenusettings top right corner)
the guide you found is no bad idea to go for, as it has so much included, like up to date softmod, and good loader programs you can use. stick to the route suiting your systemmenu version (also you could jump in in chapter 2 as the hbc is present, or you want to upgrade your hbc then run the hackmii installer through the present hbc). and end up prefferably on vers. 4.1 or just stay at your old firmware doesn't really matter (4.2 and 4.3 has absolutely no advantage) guide will also get you priiloader on your console this will even prevent disc and online updates.
maybe you post a short hello in the introduction section there you will also get a good set of useful links.
good luck for now
edit: also both games can be found here.
Problematic Games & solution