I donate blood every six months. You are doing a wonderful thing. Just breathe and relax. You will meet with the phlebotomist and she/he will ask you a series of questions. They will prick your finger and take a tiny bit of blood to test for iron while completing the paperwork. Then you sit in a chair like a recliner, very comfortable. You will feel a little stick and your donation begins. Afterward, you will drink the orange juice and eat some cookies or crackers that are offered after your donation. Make sure you at least drink the orange juice. Everyone is very kind and gracious. Congratulations on your first and hopefully not your last donation. There is always a shortage of blood.