Cable autists, I have a home with CATV cable and want to run a new cable line to a different bedroom (the blue line). The house is 20 feet in the air on pilings, the existing cable (red line) runs up the pilings, up a wall and into the attic, then back down a wall to a wall outlet.

Looking at this rationally it will be a massive pain in the ass involving a scissor lift just to get it to the base of the house, then a fish tape to get it into the attic. I'm pretty sure cable only comes in 50ft or 100ft, so it'll have to be 100ft. Would you trust xfinity's mexicans to pull this off or am I stuck having to do it myself?