My daughter was on Remicade for 8 months last year. It took 2-3 infusions before she began to feel better. She liked Remicade much more than Humira because even though the infusions aren't the most convenient, she liked them much more than the weekly shot. She usually read, watched movies or slept during the infusion. She got pre-meds too, Tylenol and Benadryl, which made her quite sleepy. The whole process took about 3 hours for us, so she missed a day of school (which she didn't mind at all - she said was like a vacation!).
She never made it to the 8 weekly infusions (symptoms returned) and had infusions every 4-5 weeks. She also took methotrexate, both for her arthritis and to prevent building anti-bodies.
Once she had to stop the mtx, the Remicade didn't work very well for her joints anymore. Her Crohn's however, is in remission (she had clean scopes right after her last Remicade infusion). She didn't build antibodies to it though, so we may go back to Remicade at some point.
Can't think of anything else to add.. many kids do great on Remicade! I hope Emily will be one of them! Good luck!