Trenching, conduit and running fiber

I'm in Northern California and I am wondering who I would talk to about running conduit from my house to the street? I've spoken to the Fiber Company that is available on the street below and they said it is to far for them but if I want to run conduit to the pole they will run fiber to my house. It's about 125' down hill. It will also need to go under a sidewalk. I'm done with comcast and their over limit fees. This will save me about a grand per year with better speed. So very worth it. Should I just talk to a plumber? Thanks.