Its Zetec, not Z-tec. We don't need the Honda crowd thinking our engine is a V-tec ripoff...
For what it will cost you in parts and labor, you'd really be better off trading in your current car for one with a manual. A 5-speed to 6-speed swap is pretty much straightforward because the Zetec ECU is able to understand 6 forward gears and most of the hardware required for the Getrag 6-speed is already in place, however going from ATX to any MTX is a big pain in the ass. You need a ton of different parts, a new ECU from a car with a MTX plus the keys and lock cylinders (or have the new ECU's PATS system reflashed for your current keys or turned off.) There's a lot of stuff on a MTX that your car doesn't have that you'll have to buy, holes that need to be cut, wiring harnesses added and the entire computer changed out. And that's all on top of the labor required to remove and replace the stock transmission.
If that doesn't deter you, contact v6focus on here (or go to his website; www.focussalvage.com
) He's done multiple swaps between various Focus models and is considered the resident expert on swaps.