Is there a notch in the base at the front of the machine?
If so, I would rent a toe jack, and gather up some 1"x 4'heavy walled pipe, and a 5' heavy pry bar, and some scraps of 1/2" plywood.
Once you get the front end of the mill up just a little more than 1/2", place a piece of plywood at the front corners, just as insurance, then continue to lift just beyond 1" and place two more pieces of plywood at the front corners, again, as insurance.
Proceed to lift slightly more, until you can slide a pipe under the mill. Repeat this procedure until you can get two pipes under the mill. I would have a minimum of 5 pieces of pipe, or solid round bar is even better. Once the mill is up on the pipes, and you have at least 3 pipes under it, roll it forward, adding pipes as you go. You can easily "steer" the mill, by fanning out the rollers, and utilize the pry bar as well. Reverse the whole procedure when you get it to where you want it.
Brian