Hi S.,
My son had his T&A (as they call it in the medical field) removed in June. He was 3 1/2 at the time he had a friend who had them removed the following week.
Plan that the first few days will be rough. We were told to give tylenol with codeine for the first 24 hours at the exact time (or even 15 minutes earlier) just to keep him comfortable. This worked (although consitipated him, so have some prune juice on hand!). By the 2nd day, we were able to switch to regular tylenol and used the codeine only at night.
Night time was hard on him since you don't swallow when you sleep, so your throat gets really dry and when it gets dry, they don't want to swallow (even though this is what will make it feel better).
I was also told by a nurse friend of mine to offer as much gum as he wanted since the gum makes you salivate more and thus swallow more, its keeps your throat wet and able to heal with less pain. The big thing is drink, drink, drink keep him hydrated. He won't want to drink, so this would be the time to pull out some new cool cups or something to encourage more drinking.
Make sure he las a good amount of "quiet" activities: movies, coloring books, activity books. Leap Pad was a huge hit after surgery. I think I remember that even though he felt better by the 3rd of 4th day, we still had to keep him from running around. He didn't get that. We kept him on soft foods though for a good 10 days. His friend who had hers out the following week was eating grilled cheese (not recommended) by like the 3rd day. I only say that to show you that there can be very different post surgery reaction.
The hardest thing for me was having them take him away when it was time for surgery. I bawled like a baby when he turned the corner. The younger they are, the easier the recovery.
Please let me know if you have any other questions. I am not by any means an expert, but just a mom who recently went through this. :-)
B.