I had this surgery 10 years ago (in Amstelveen, Holland). It really helped a lot. I didn't have polyps but just narrow passageways to forehead and cheek sinuses as well as "hypersensitive" mucous membranes that were reacting abnormally to normal stimuli according to the aeromed and ENT guys. Apart from incredible headaches I also was getting regular sinus infections so it was really affecting my work. (737 loco/charter)
In those days it was a 2 night stay in the hospital and I did have a black eye one one side from a nicked capiliary. Also had to keep antibiotic gauze "stuffing" in my forehead for a week that was removed in the polyclinic (4 meters of gauze pulled out through my nose, but that's another story
) - to prevent an infection. Plus I wasn't allowed back to work for several weeks to give the mucous membranes chance to settle/calm down.
It has really been a godsend - now get a cold maybe once a year and it rarely goes through to becoming a fullblown sinus infection - plus the headaches are a thing of the past. It was only after I recovered that I realised how bad/frequent the headaches had become.
The warnings did indeed sound dire but there is such a small chance I am certainly glad I had the op and wonder if I would have kept my medical if I hadn't done it.
Good luck with yours!