Adam, it's straight forward, but take your time (at least, that's what I did)...
Print and read the instructions you get with the SmartTop, and also the DIY on this forum too (I think the link to that is in the post that's linked in my signature). I read both several times, just to make sure I was comfortable with it. I didn't remove the accelerator pedal to fit mine, but the carpet is difficult to keep out of the way with it in place, and Col says it's MUCH easier if you remove the pedal for the install (apparently just one bolt at the base of the pedal).
The most painful part of the install is opening up the canbus cover... I'm sure there must be a knack to it, but I didn't find it... probably took me half an hour just to get the canbus cover opened (took me 90 mins total to fit it). Also, be very careful of the clips that are there to hold the kick-plate in place... they WILL shred your arms if you don't cover them with something soft!
I took power from the rear of the headlight switch (as per the instructions) and I crimped a new (round/circle - not sure of correct name for it) connector onto the earth cable and added it to the main earth point behind the plastic panel to the right of your right foot (rhd car) - you'll see it when you remove the panel.
Everything you need is included, except the circle/round connector I decided to use for the earth connection (although you do get a scotchlok type connector for that if you're happy to use that - but I preferred to do it this way instead).
Finally, make sure you connect to SmartTop with your laptop via USB before installing, as you can check for latest firmware and set-up you're preferred options more quickly that way. I left the USB cable fitted in the SmartTop, and ran it to poke out from the plastic panel to the right of your right foot... might be useful for future firmware updates, although I will need to use a USB extension cable to get to it as it's quite short.
Good luck, and I hope that about covers it!!
