Hi - nothing much to say about retro filling BT to be honest. I checked to see if the radio had the BT option in the menu, then purchased the bits I needed off of eBay. These consisted of the module, microphone,and cable to connect it to the radio. From memory, I bought module mounting bracket, thecable and 3.5mm socket for the AUX facilty on the radio,and the audio stalk with the VOICE button from Ford. I didn't use the control in the end, as the VOICE button didn't work - I do not think that the wiring is there. Instead we use the button on the end of the stalk. The advantage of using a used BT module is that its already been activated in another vehicle. This was came out of a Focus.
Once I had all of the bits, I then went about dismantling the dashboard - the module sits above the glovebox, so I had to remove/loosen the gearlever gaitor, and surroundand various bits of trim. Took me about 4 hrs. If I'd known what I was doing, its a quick job - but you know what Its like when you tackle anything for the first time.
2010 1.6TDCi Titanium, Panther Black, Sony 6CD DAB, USB/BT, Privacy Glass, F&R Parking Sensors