Please, please, do not let Best Buy touch your car. Especially something that is THAT integrated into your car.
If you can't do it yourself, find a good, reputable independent car stereo/alarm install shop to do it for you. 2 of my good friends work or have worked at a "good" stereo shop, and a lot of their work was uninstalling crap that Best Buy would put in there and screw up.
You might get lucky and find a BB with an installer that knows their stuff. But honestly, if they were that good, they can make a lot more money at a car stereo place instead.
2004 Buick LeSabre Custom FE5 GXP suspension conversion. 170Kmi
2001 Silverado 4WD 5.3L, 33" BFG ATs, Z71/Z82 pkg, 147kmi.