So how do they take out the needle once the iv line is in?
You hold on to the actual IV (which is the soft tube which is attached to a port) and the needle simply slips out. Then you push a button on the needle “handle” for lack of a better description and it goes “POP!” and retracts into a hard plastic safety sleeve (so you can’t accidently poke yourself.)
I would be holding on to the port with my left hand thumb and index finger and retracting the needle with my right. After the needle is retracted into the safety sleeve, I can set it down and then apply tape to the port to keep it in place. Then my hands are both free to apply a nice dressing. Usually a clear film.
This all takes literally seconds if the person has easy to access veins.