That is one of the easier stoves to move. I move them all the time by myself.
As begreen suggested, remove door and fire brick first.
A furniture dolly can be used under it, and you lift one end at a time with a 2 X 4 lever. Most Baby Bears are rear vent, so a 2 x 6 fits into exhaust opening and can be used as a long lever to lift it easily while you roll dolly under. The lever can go through the stove from the front as well into flue opening, so it works front or back. Blocking on dolly raises it until legs clear floor.
With steps, I don't keep them on wheels. I lay planks on stairs, 2 X 6, 2X 8, whatever you have. Lay stove on its side at bottom and "walk" up as far as you can. When you feel it may slide back down, attach hand winch with strap around stove. I put a 4 X 4 across door way at top to winch from. Once at the top, get it back on wheels and roll. This works with the largest of stoves as well. Larger stoves and boilers require temporary post under weaker stairs for support.
Same as loading on truck. Ramps, lay on side and winch.