Tubes are a breeze - considering his age you'll be an early appt so you will probably have to get there EARLY. Ben's first set was inserted at 14 months. I think our check in time was 6:00!!! Which is better since they can't eat or drink which is the hardest part.
Dress him comfy and warm, bring a blanket if he has a favorite one - the surgi centers/hospitals tend to be cold. Dress the same yourself. Bring an assortment of toys b/c from check in until they are rolled away can be quite a while, easily over an hour. They need to have a check up to see if they are well enough to have the surgery, the anesthesiologist checks them out, then just waiting your turn.
You'll only be separated from him for a short time if it is only tubes. Depending on how he reacts to the anesteshia his time in recovery will also be short. You should be able to be back with him in 30 minutes or so.
Once at home, a bit of pain relief is all that was ever required for my son. Of course he has unusually high pain tolerance so I'm not sure if that is normal. He bounced back pretty much instantly and it was a struggle to keep him quiet. He had tubes/adenoids at 14 months, a vallecular cyst removed at 16 months, new bigger ear tubes at 18 months, a 3rd set of tubes at 2.5 and the 4th set at 4. Now he is 5 and 1/2 and is going in on Jan 15th have both tubes removed because they scarred over, have his tonsils removed and repair a hole in his eardrum because he got an infection and it ruptured b/c the tube was blocked! He didn't even complain about the ear until AFTER it ruptured... the doctor was amazed, but like I said he has a high pain tolerance.
In all 5 of those surgeries, he's had only on lasting complaint. At All Children's Hospital they use a pre-anesthesia gas to relax them and so they don't know the IV is going in... they let them pick a 'flavor' of gas. He chose root beer and he expected a glass of root beer. He is still bitter that they "LIED" to him.
His first 4 surgeries were at such an early age, he doesn't remember them. The last one was only a year ago so he does recall it pretty well, and still he isn't afraid or nervous about the tonsils/ears. Kids are incredible... YOU are the one who will set the tone for this experience, if you are freaking and nervous so will your child. So just relax and go with the flow and it will be a better for everyone. I have had plenty of opportunities to see nervous nelly parents who make the experience awful for everyone involved. It is a huge disservice to the child for the parent to be freaking out, because they pick up on that and then they become afraid and it makes it so much more traumatic of an experience when it doesn't need to be.
Good luck!
L.