Hi Hanna,
My boys are doing IVs right now. My son Josh right turned 15 and my son Jesse just turned 11. He's in the fifth grade, are you too?
Going in for IVs isn't that bad, my kids find it more annoying than anything else. Of course the first time can be scary because you don't know what to expect. You will definately feel better when you come home.
Usually what happens is you check in at the hospital, you go to your room and the nurses help get you settled. You and your parents will answer LOTS of questions about your health. Usually you will get your IV line placed by a special nurse. My kids get a PICC line which is an IV line that goes into your arm with a little tube. On the end of the tube there is a plastic screw cap where the nurses put in your medicine. When its time for the medicine they bring a small pump on a pole that pumps the medicine into your IV (usually takes 30 minutes). Then they disconnect you until your next dose. You can walk around your room without being hooked up. My kids like to bring their own clothes to wear because they think hospital clothes are dumb. Sweats or flannels are good, and slippers or flip-flops.
During the day you will have chest PT two or three times to help you clear the junk out of your lungs. Again, that's annoying especially if you are trying to watch TV.
Bring lots of stuff to do, puzzles, game boy homework etc. It sometimes gets pretty boring. The activity person will probably bring you fun stuff too.
If you have any questions, write back. Right now I'm home, but I'm going up to stay with my kids tonight. I'll ask them if they have any advice to share.
Good Luck Hannah! Let us know.
Jane