Hi, fitted a set to my bike on Friday.
They are pretty simple, but require some fiddling to get the brake side set up. The gear side is very simple bolt off/bolt on.
The brake light switch on mine was practically welded on to the old brake pedal - in the end I had to pop round to Griff's to get it out. Then we needed to shim out the sensor trigger on the Gilles with some washers as it wasn't contacting the switch.
You will need to take the m/c apart and in doing so will lose hydraulic pressure, but you'll have to cut the reservoir pipe down to fit anyway. Once it is all assembled you'll only need a quick bleed and then you'll be locking the back up at 50mph!
Just make sure you have some threadlock and penetrating oil/wd40 to soak the brake switch...
John