Humira's dosage doesn't change in amounts as the drug is not administered by weight. It is adjusted by giving the dosages every 8 weeks, 4 weeks, or 2 weeks after the initial loading dosages. crohnsinct is right, it does sting a bit. There are tricks to help reduce that, but not by as much as the kids would like in my experience.
Blood work isn't needed to be drawn as much with Humira as it is with Remicade, but when you do need it you have to go to the blood work clinic. Meds are shipped right to you in some cases, most go to the pharmacy for pick up. It needs to be refrigerated, but other than that you can travel with the med and not worry about scheduling infusion appointments.
We didn't have a choice on which drug to try for biologics because we needed something to work fast and Humira can take a few weeks or months to kick in. No matter which biologic you try, I would recomend using combonation medication therapy to help prevent antibodies from being formed, either Methotrexate or Imuran are the typical ones. When an adjustment of meds happened, it normally was on the immunosupressives.
If you like the ease of doing the needles at home and not being tied to more appointments I would actually recommend Simponi. It is so easy the kids can inject themselves (after a nurse teaches them). My daughter started doing them herself, and is the 1st drug I could see her being responsible enough to continue with and it causes her no pain injecting herself. It comes in a pen form. Not many kids are on it yet. It is still fairly new. I would suggest speaking to the doctor about the possibility.