Your best bet for removing the tank is a second set of hands. When I did mine, I unbolted the two from bolts under the rubber covers (torx heads I believe) and the two bolts at the back of the tank under the seat. From there, you just lift straight up. It will lift with ease. This is where you have someone hold the tank up while the power cables are ran. That part won't take long.
As for the speakers, I too had that same concern. I promise you won't feel that way after you hear them. The seriously are the best sounding speaker/amp setup you can invest into.