Cost wise for our 10,000 ft of fencing that we installed ourselves, rails and post was $30,000 or so. I think having it installed would have doubled that cost. My husband and I along with two helpers put up all the fencing, from digging holes, to concrete, to running the rails.
One extremely helpful tool that we used to run the rails (660 ft of rail per roll) was to put a 2" ball in the middle of a 4x8 sheet of plywood and put a drag rope on plywood and pull it behind our truck (RTV would work too but we did not have ours yet at that time) putting the rail so it would unroll as we drove. Worked a charm. We used a marking post to put in the brackets that hold the rails and installed brackets before the rails, screwing them on with wood screws not nails. Cordless drills and we could run through them pretty fast. For concrete we have a sprayer that we put water in (50 gal) with it’s own motor when we did not have a water supply nearby to mix concrete. We got it down to a science, very proud of how it all turned out.