Hi H.,
I applaud your plan to help your children prepare for their surgeries. My oldest daughter had a similar surgery when she almost 3 at Rex Hospital.
What I did to help her (along with setting up the prayer team for all of us) was to shedule a tour of the day surgery area with my one of the Rex Volunteers. It took me being on the phone 5-10 minutes, but it definitely worth setting it up. We actually went for the tour two days before the surgery.
My daughter got to see the waiting area, where she'd be before the surgery, a glimpse of the doorway she'd go through with a nurse for her surgery, the post-op area, and the waiting room where my husband and I would be while she was away from us. The Rex volunteer was great in showing her "this is where your Mommy will check/sign you in and fill out a little paperwork." She showed my daughter where the coffee was, so she could her Daddy get a cup of coffee while Mommy signed her in. When we were in the post-op area, the volunteer showed her where the nurses station was along with the snacks. She talked with her about needing to eat a popsicle or something equivalent after the surgery, as one of the things she'd do before going home. She offered my daughter a popsicle or a little cup of sprite and graham crackers. I don't recall which she chose now, but she soaked it all in.
When we went back a couple days later, she was in the know and enjoyed her role of "barista" even though all she had to do was show her Daddy where the coffee was. I think her anxiety level was lower because she knew a little of what to expect.
Chances are very good that you can schedule a similar appointment, too. If you are going to Rex, just call their main number ###-###-####. If not, call the facility and ask for a little tour. (Even if they've never done it before, you could likely persuade them to do it.) You may want to keep in mind that it would probably be either mid-morning or early afternoon, when there might be less patients in the areas you want to tour. If you still have nappers, you may want to have an idea what times you'd like to try the tour before you call.
It sounds like you are armed and ready for the post-op time at home. Thankfully the time will go by quickly, and the children will forget the pain when they are older. I know it is hard to watch your child in pain, even when it from something that makes them healthier in the long run. Enjoy the snuggle time you'll get next week. Your family will be in my prayers.
All my best,
Michelle