Kevin
I have a Warco WM16 mill which looks to be a similar design.
I bought it secondhand and it was in a first floor workshop with access via a narrow staircase.
I split it into 3 parts to move it.
I removed the head in one complete part with just 3 nuts/bolts to remove. I watched this video on you tube to see how to do it. He went over the top making a block to hold it. I just lowered mine onto a block of wood on the table. **LINK**
Then I removed the table just leaving the base and column together. I removed the complete x/ y table by winding it forwards. I had to remove the lead screw nut from under the table . It was held in place by 2 screws, accessed from the back. This is the heaviest part but one person can lift it though best with 2. (My son in law moved it from my car to my workshop on his own before I had chance to help!)
Myself and previous owner carried the parts down the stairs between us without any problems.
So you should have no trouble doing the same.
You can download a manual from the US site of Grizzly tools which looks like a similar design. **LINK**
Stuart