Re: Terrible Plaster Ceiling, Help?
Pulling down old plaster ceilings is in the top 3 of worst experiences on old house renovations. The mess goes all over. Get a large (30" diameter) exhaust fan and place it blowing outside from a window or door. Tape doors shut to the rest of the house. Have a dumpster ready, many metal trash cans and as many friends as you can dragoon into assisting. Keep telling yourself that you will live to tell about it. Wear a respirator.
It may be worth the effort to find someone who can repair plaster rather than go through the ordeal. You will probably find that the old framing is not exactly in the optimal state to receive new drywall, either, and will need some shimming or planing to get the bumps out.
One of my first jobs was installing 1600 sq ft of tin ceiling and cornice. We used the products from W.F.Norman co. in MO; they have a really neat catalog. Tin is "interesting" to install. Get really good gloves.
You might consider leaving the plaster where you will have tin, and installing furring strips for the tin to nail into. Without any additional soundproofing or backing tin is going to transmit noise in both directions, (if there's a room above, you'd hear every footstep, clearly).
Remove not the ancient landmark, which your fathers have set.