Reading around the Internet and printed publications about those recommendations is interesting and shows how complex systems our bodies are. The recommendations vary greatly.
Some might have to do with implant used or technique chosen.
Some are up to the doctor's interpretation.
Some will depend on doctor's interpretation of how the wound is healing.
I have discussed the following with my surgeon:
What should I do and don't after the surgery?
Do use the ear drops twice a day from the day 1 till they run out - ofloxacin 0.3% help with wound healing.
Do take antibiotics prescribed 3 x 500mg Amoxicilinum a day for 7 days to prevent postop infections
Do be careful when standing up faster the first few days
Forget about the implant and move on with our life.
Don't get the ear wet as this can very seriously complicate the healing process 6 weeks if you can. Consult otherwise until you inflamation has cleared.
Don't travel by train using tunnels (pressure changes) for 2 weeks post op.
Don't travel by plane for 6 weeks.
Don't ever dive under 10 meters (200 kPa) - this is controversial but the whole concept is mostly built on the theoretical assertions and not much proof exist that barotrauma has different complications for patients after the stapedoctomy. Diving is moderately risky for anyone and many people (from the general population) will not go under 4 meters due to discomfort in their sinuses or ears.
Don't ever skydive
General advice not related to my condition or operation I had:
Never get bath water in your ears.
Avoid air travel with inflammation of an ear (including eustahian tube). This is common with colds, sinus infections etc. blocked eustahian tube and vhanges in ear pressure can in severe cases cause rupture of the tympanic membrane and hearing loss.
But what if I go on the plane and I notice dramatic hearing loss in the previously operated ear? (thinking about Sanguine 2011).
Call us immediately you will be scheduled for ASAP revision surgery. Time is precious in those cases as there is risk of severe hearing loss in case of serious implant dislocation. This could also be due to ear drum rapture. See a doctor who is equipped with otoscope immediately and can look down your ear canal.
I did not write down these answers so this is my subjective recollection. Always listen to your own doctor but don't be afraid to ask.