Like others said, don't go with an electrician.
It's very hard to ballpark without going to the site. How do they know if the wall doesn't have a structural beam separating the floors? That's just one example of things they have to check for.
It could be really easy too but they don't know unless they are there. Maybe someone could do it over a video call but even that's tricky.
Like others said, buy a snake and do it yourself. We would be more than happy to go over the steps, parts, and tools you will need.