We’ve got our hands cut out for us

This is a mixture of “our work cut out for us”  and “we’ve got our hands full”, both meaning a lot of work is ahead.  There are other phrases involving the word “hands” that might be in play –  “many hands make light work”, all hands”, “helping hands”.    Perhaps the severed hand below will help…

Let’s roll up our elbows and get to work

This one is a mash-up of “roll up your sleeves” and “elbow grease”, both idioms describing working hard.  Rolling up the elbows fuses those idioms together very nicely and describes applying oneself to the task at hand perhaps better and certainly more succinctly!  By the way, this is another one of the master’s gems.