The coaxial cable for cable tv that goes to my second floor tvs needs
to be replaced. The coax cable somehow runs up onto my roof, through
the attic, and then connects to a splitter in the attic. The cable is
hidden in some places and runs through small holes. The cable company
told me it would cost me a lot if they replaced it. After the lousy
service I've had from them in the past and the fact that they step on
the ducts running through the attic, I'd actually prefer to replace
this cable myself.

How difficult would it be for me to replace this cable? It looks
fairly easy except for in the few places it's hidden along with the
fact that I don't know how to get it through some of the holes. I
figure they must use some special device for running it through the
holes in the walls. I think I can get my father to help with this
project. I'd just like to know how hard it would be and what kind of
tools I'd need. I also don't want to remove the existing cable until I
can get the new one in. I don't know if two coax cables will fit
through the holes. Any thoughts?