My dd had hers out the summer just gone. she was 2.5. It was the best thing we could have done, even though I cried during the op, cried when they brought her back, and cried a bit more the first 24 hours, - mind you by then I think it was because I was knackered (can never sleep in hospital).
Stock up on painkillers and use them religously, get lots of nice things to do if the weather stays crap as you must avoid crowded places. She had hers done during that awful rain last summer, we spendt the time potty training.
At first she refused all foods, until I gave her a packet of quavers, followed by toast. Rough food, cleans the pus/scabs that form in the scars and allows for quick clean healing. She was back to normal by day 4/5 and we could stop the pain killers by day 10. might have been able to do it before - but she likes the stuff. for the first few nights we woke up up at midnight to give her painkillers so the mornings wouldn't be painful.
on painkillers, she hated the 'generic' stuff they tried to give her in hospital, and the staff were a bit disgrunted that they had to give her the more expensive 'branded' painkillers, but hey.
Make dure you take food in for yourself and a couple of mags or a book. the other parents were quite nice to talk to when the little ones were asleep.
Its a good age, a 15 year old was having hers out at the same time and she found it very difficult, my dd found the toys and had a great time.
hope that helps