Just only one tip that might be helpfull when flying aproaches manually:
If you are flying with AP and AT engaged and decide to fly the aproach manually, DO NOT FORGET TO disconect the F/D after switching off the A/P. If you leave the F/D bars on, and you are descending of THR IDLE, the A/T will not revert to SPEED mode and therefore, if you decided to level off manually above altitude selected on the window the autothrust WILL NOT mantain speed cause it will remain idle, not very nice when close to the ground!!
I donīt know if the above is true for all A 320 MSN.