Well, don't avoid smokers as such, just don't be standing right nest to them when they are smoking! It can increase the risk of bleeding.
I have looked after 4-5 post op tonsillectomy patients a week for about 4 years, I have only ever had to keep in maybe 2-3 in all that time as they were not well enough to go home. For uncontrolled pain or nausea or their temp being too high.
With regards to the wound, it is what it is, and one of the reason rough food is recommended, it will aid in healing and you will get over it so much quicker. They give you plenty of pain relief during the procedure, pretty much the full whack, morphine, diclofenac, pethidine etc..and they will send you home with plenty. Just make sure you take it before you eat, and even if you don't think you are in pain at that time. And drink plenty of fluids, not fizzy or fruit juices, but water, keep hydrated and keep your throat moist, hence why chewing gum is also good. It will be painful but use your painkillers and it will be bearable and after 1-2 weeks that is it...how long has your worst bout of tonsillitis lasted? And to suffer that again and again repeatedly, or, never suffer it again.
There is always someone who has had a terrible experience with anything, when you are pregnant you get the birth horror stories, you wait for a knee op you get the knee horror stories.
On the day you will be admitted by a nurse, seen the by surgeon and seen by the anaesthetist. explain to them how nervous you are, the surgeon can go through it all if you wish it as much or as little detail as you like, before you sign the consent form. You can even ask for a bit of something before hand, to help calm you down. Something like Temazepam.