Scheduled for ALIF surgery. What can I expect?

I'm 65, experiencing foot drop and other related nerve compression symptoms. I had a Peroneal Nerve Decompression about 4 years ago on the right leg, but that is not now recommended for the symptoms on the left side. I'm scheduled for ALIF in April to stabilize degeneration of the L5-S1 due to a fracture, and also the L4. I'm told that this will involve placing spacers via the abdomen, and placement of screw(s) via the lower back so that the bone can heal.

According to the doctor, recovery is 3-4 weeks of back soreness, with therapy starting at 6 weeks approximately. Bone regrowth should be visible at 6 months. I'll be in the hospital for about 2 nights, barring infection/complications.

I'm curious to hear about the experiences of others who have had this type of surgery, from the patient's POV. How painful is it afterwards/during recovery? How limited is mobility? What pre-surgery prep will I have to do?

Any insights/similar experiences would be most appreciated. Thanks in advance.