Apologies for this wordy/verbose(?) post, but it's late.
The outer is easy to remove as described above; also a good idea to cover the fender prevent damage if the outer fairing slips (which is a pretty rare occurence) and the tank, with some heavy socks pulled over the passing lamps since it is tight going getting the fairing past the lamps. Bottom line, it's a very easy procedure.
As for the Biketronics install, an excellent value is the package that includes the interface unit (to allow handlear controls), mounting kit to install the headunit, speaker adapters to allow mounting the speakers to the inner fairing, HogTunes speakers, and fairing mounted antenna, and Sony GT 510 headunit.
The installation of the headunit is a little tedious because you are installing screws to secure the headunit through the vertical fairing brackets to the headunit and finger space is tight.
The interface unit incudes seven wires that must be spliced: one wire goes to battery power, one wire to accessory power, one wire goes to ground, and two wires go to each speaker. The power wires can be spliced to corresponding heavy gauge wiring inside the fairing near the steering neck; the ground wire should use a spade connector and connect to the ground wire bolt near the steering neck.
All of the splices are easily done; just tedious to work without a lot of space and with a lot of other wires nearby.
With the splices done, you plug the Base Audio Connector (a 23 place AMP connector)from your bike's wiring harness into the corresponding socket on the interface unit, and plug the Sony compatible plug into the rear of the headunit.
You install the speaker adapters with the speakers to the inner fairing with three screws for each speaker that are already there and connect the speakers with the speaker wires previously mentioned.
Then mount the antenna inside the fairing and plug the end of the antenna cable into the rear of the headunit.
No special tools are required, though a test light is useful to identify the battery and accessory power wires that you splice into.
I have had the Biketronics unit on my bike for about a year and 20K miles with the Sony GT 510 and it works great.
CMA, Crossties Chapter (GA)