Well first thing is first. Cause I was swapping my rubbish old 4 speed slushmatic out for the T5 an extra pedal was needed. I have no idea whether you could install a new pedal box without removing the dash altogether, it could be possible but I think removing the dash was pretty easy, just a process really.
Getting the dash out is actually quite easy. The only problem is that you have to remove a whole heap of trim parts to get to it out. And for some stupid reason Ford decided to integrate the handbrake into the centre console, which I don't really understand cause the handbrake is bolted to the floor and the centre console is held in at enough points to firmly secure it. Anyway, the reason it's a bit painful is that you have to remove the drivers side seat to get to the handbrake bolts so that you can then remove the centre console.
So once all the plastic trim parts are removed and the centre console is out there are only something like 8 bolts holding the dash in. They're all pretty easy to get to apart from one which is at at the top of the dash underneath the windscreen. This bolt was a *beep* to get out so I didn't end up putting it back in. I've driven the car a fair bit now since the conversion and there are no rattles or anything so I would recommend leaving it out unless you really want it back in.
The electrical system needed to be unplugged but it was easy. Most of the major electrical plugs are in the drivers and passengers kick panels with the only other plugs running to the pedal box, the air con unit and the BCM. There is one sneaky plug on the transmission tunnel near the bolt under the BCM.
The pedal box is really easy to get out once the dash is removed. Just 2 wiring harness plugs, 2 nuts securing the box onto the body and 4 nuts securing the box onto the brake booster.
Oh and one thing I did right from the start was to label every single nut, screw, bolt, wiring harness plug, pipe, hose, everything. I just used some masking tape and wrote descriptions for each part. One of the best things to do is not only label the part but decribe where it is and which way it goes back on. This was pretty handy on the boost pipes and radiator pipes etc. It feels like overkill when you're taking stuff off but after a few months between removing stuff and putting it back on it was an absolute lifesaver. Believe it or not the only bolt I had left over after the whole conversion was the one I mentioned earlier that mounts the dash behind the windscreen. Apart from that I didn't have any leftover bolts or parts.