So I gave up on the DCX3510 and purchased one Gateway and two Portals. When I open the box there is a sticker saying "complimentary professional installation is required". Is this really true? How hard can it be? I don't "think" I need any new coax installed - outlets are where I need them. I found a doc online on this site that shows the simple connections. I am quite comfortable with what appears to be a simple setup. What am I missing?