i didn't mentally prepare; it was probably better that way because it way less of some scary landmark than just a thing that happened that i had to deal with for a few days. The painkillers they gave me were addicting, so I had to do some kind of step thing to ween me off, but that's loving stupid so I just took the stuff they gave me at the office and ignored the prescriptions because no pain no gain.
If you want to make any preperations, ask your parents to invest in a ton of soft food next time they go to the grocery store.