I only have experience with the 737-800, but it is a non event.
Cpt becomes PF as his PFD and MFD and Upper DU is the only ones working. AT off, as AP has gone. Manual pitch trim.
Descend and start APU.
Engine driven pumps keeps the hydraulic at a happy 3000psi ( Not to be confused with manual reversion ,TD, as that is something You for sure will remember on a dark and stormy night!!)
Flaps and gear drops normal.
What more does a man want!?