Really. I'm with Eteocles on the software side.

As for not understanding anything in the guides, that might indicate that you're trying to make multiboxing something it isn't. Don't think of multiboxing as botting. The alts don't play themselves. You have to play everything. The only difference between playing one char and multiboxing is that your alts work off of /follow and /assist. Otherwise, the spells are the same as you'd use solo.

My advice: read more. Go slow. Stop trying to jump in in a day and have it "just work." I've been doing this for 5+ years in WoW and DAoC and it's a bitch to keep things working efficiently. What works in PVP won't really work in PVE and vice versa. What works for a fear-bomb encounter won't work in a mind-control encounter. And those two won't work in a tank-n-spank encounter. There's a LOT to it. You're basically playing an entire group and have to micromanage the entire thing. If you're OK with that and can apply creative problem-solving, you should be fine after some work and experience.

Good luck, but don't expect us to show you how to multibox from the ground up all over again. We've already done that. It's now up to you to find the guides and threads here and apply the knowledge we've so graciously shared.