The first time I gave a patient bloid was a few months ago and a second opportunity came about the other day so I asked a senior RN to help me get it set up. She got me to program the pump for the wrong line (I should have thought of this perhaps) causing error messages galore. Patient wasn't harmed (didn't get any blood) but a unit of blood was wasted when we tried to prime a new line thinking that was the problem and saline backed up into the bag. I feel silly and guilty about the wasted blood. Even though this has happened before on the unit I feel like I should've known the issue even with my lesser experience. Any advice would help- I'm losing sleep over this