I am very nervious about doing this.
I completely understand you being nervous about it...making mistakes in the registry can be disastrous!
I can tell you that these instructions are correct, however they may also make you feel like you're walking on egg shells. But please do keep in mind that in the link I provided, there are two other Methods to accomplish the same goal.
How about looking over Method:2 from the link in my previous post? There is much more room for error there, and you should be able to do it without much trouble at all.
Method:3 is another way to have Microsoft do it for you...but I would give Method:2 a shot as it's a safe route and you can learn a few things along the way.
Just be sure to follow the instructions closely, and you'll be okay. Backing up the registry is a good idea in any case, so you may want to do that as well (i.e. create a System Restore Point) before you begin.
If you have any more questions, feel free to ask!