If you want to take it slow with typing, I highly recommend checking out [https://www.keybr.com/](Keybr) if you want to develop muscle memory. It adapts its lessons depending on what mistakes you make, and starts off with a few keys at a time.
It's funny you mention guitar hero, because I've always tried to be "guitar hero good" at most things- cooking, talking at parties, flying a kite, actual guitar hero, whatever. I don't know where I picked the phrase up, but it just means that you're good enough to get through stuff on normal mode. I haven't played guitar hero in awhile though. Do they still make games for that?