Nonsense Brian,
I am the least mechanical guy on this site. I just needed people like COSMO to tell me to dive in. He said it was scary at first, but then empowering. And he was right. Plus, working on the 3-speed is giving me confidence I can handle the overdrive part.
If you're waiting to find a guy near you to do one of these, like I was, don't. You can easily handle this.
Best,
Jim