That's the guide I've used on several Wii's. I did that with the Indian Pwns hack. You should have success if you follow that.
If you have any questions about the modding, I'd be happy to help. While the modding is fairly straight forward, there are lots of factors involved, and if something doesn't work it can be hard to pinpoint what's happening. For example, on my first Wii, I did everything correctly on the Wii, but the copy of the game I downloaded was corrupt, and it caused an error when loading. I never considered a corrupt game image, and kept fighting the Wii itself, thinking that was the problem. I started the process again from scratch twice before I tried a different game image, which then worked flawlessly.