Oh I've had my sinuses drilled and some turbinate bone removed. That was after years of almost permanent sinusitis. I had loads of headaches, struggled breathing through my nose, had lost my sense of smell and taste and seemed to permanently have snot dripping down the back of my throat.
Had it on day surgery so still felt groggy when I came home. The next day I didn't feel too bad. I did a few jobs around the house and thought it was way better than I expected.
The next day I woke up in extreme pain. It felt like someone had been stamping on my face overnight. You'll get a bag of strong painkillers when you leave hospital. You will need them! It was Mothers Day that day as well, so I had small children dancing around me wishing me well so I had to pretend to be happy when really I wanted to shove them away 
The pain settled over the next couple of days. My nose stayed blocked for a few weeks afterwards. They recommend you keep rinsing it with a bicarb and salt warm water mixture in a squirty bottle.
After 1-2 weeks things start to loosen and you'll start blowing out incredible chunks of snot - some the size of your thumb nail. I'm still astonished as to how they fit up my nose. You might get some nosebleeds at this point too.
Another 2-3 weeks and the snot chunks get smaller and the nosebleeds are less frequent and you'll start smelling and being able to taste again. Things like fresh air will smell wonderful at this point.
Not going to lie, it was a horrible operation. But if you can put up with a painful week and another couple uncomfortable weeks till everything settles down afterwards, your life will be so much better.
Since my op I've had a couple of episodes of sinusitis but nothing I couldn't cope with and it cleared up after a couple of days. I've definitely never regretted having the operation and life has been much better since having it.