We used Gohn's Piano Moving to move our Steinway concert grand. They do all the moves for the University of Maryland music department.

It's best to go through a local piano store so they can set it up and tune it in your new home.

We used Jk moving but we were moving houses. Not sure you need a special piano mover. They wrapped it up well, moved it (an upright) up our basement steps, and up a ramp to the front door of our new place. Kudos to them as it was heavy af!

PianoCraft can point you to a mover. They’re nice, call them!

I would call a piano store and ask. There is one someplace in Rockville. Likely piano would also need to be tuned after the move.

If the piano is being moved as part of moving from one house to another, most movers will do that for you.

This is for a local move in DC