During my medic class we practiced technique on the maniquin arm until until we got signed off and then we stuck each other. I was a popular pin cushion in class as my anatomy is different between my left and right hands. My right hand has the radial artery in the normal positon in the wrist below the thumb on my left the artery is on the inside of the wrist where usually in most patients is a nice large vein. So if you check for a pulse on me in my left side you won't find one in the normal spot. The instructor's point was feel for a pulse before you poke as not every patient is not the same. We needed 50 live successful iv starts as a requirement for course completion. We also give each other Im and SQ injections of saline. Interesting though I have a daughter in the 4 year RN program in college and they were not allowed to start IV's on each other they practiced on maniquin arm's and bannan's and injections on oranges. She would come home on weekend's and i would let her practice on me.