"125 feet of sidewalk to shovel low enough to then use a snow blower"

Well, you may need to research techniques for using a snowblower. Try You Tube or...

Advance the blower at rapid pace into the snow for 1'. Back it up and knock the overhanging snow* down with a long handled shovel. Repeat (in a manner appropriate).

* If it's too fluffy to create an overhang, advance the blower slowly and put your weight on the handle bars to raise the mouth slowly to allow the snow to "cave" slowly into the mouth of the blower. Stop when the wheels/tracks begin to ride up on the snow or spin in the snow. Reverse and clear as appropriate.

(I realize that is a brief and sketchy description but I hope it helps.)