i done it last week its easy you just plug it into your car follow the instructions on the screen then when its done unplug it plug it into your computer make sure you download the software first. Click the bluefin program on the computer, fill out your details then click connect and it will upload your original map to them, then you just wait till you get an email from them, then you plug it back into the computer it will then download the new map onto the handset then all you do is plug it into the car and follow the on screen instructions and your car is mapped
enjoy i swear my car feels faster every time i drive it