You don't need to do anything to help the eggs hatch - as long as the female doesn't drop them.
Now, protecting them from the tetras? Remove the fish. Simple as that.
Not possible? Then *tons* of plants!
Don't have that either? Then get a breeder box that goes either on the inside of the tank or outside of the tank and set it up for the female shrimp. Just know that moving her could result in stress and she could drop the eggs.