Hi Emily
Check the guides in your PMs from recently, the one above is helpful for OEM bluetooth but the Fiscon is simpler.
Basically a quick guide is - you remove the stereo, plug in the Fiscon looms, leave the Fiscon box down the back of headunit in the massive void, run the mic up under steering wheel and past fuses, you can pry back the A pillar without removing it and feed up the mic wire trying to keep it inside the rubber, peel back roof lining and feed through mic (or remove sunvisor etc as guide above), remove roof lighting plastics and push in the mic.
And you're right, the bluetooth works independently of the MFD2 even although it is plugged into it.
David