I am going to use 4 x 12 registers connected to 6" flexible ducts. Will 1 register for air and 1 for return be enough? Do I just connect the return into the AC ducting or would I benefit more by adding a booster fan to draw the air out? Can I use a remote to control the booster fan if I purchase one? What type of connector do I use to attach the flexible duct to the main unit (what's it called)? I have never messed with HVAC but is it wrong to assume it's fairly easy to do?