Draw up one at a time, you let the patient see you drawing up unless they've asked not see (needle phobic). Lots of people like to see the vial and it's reassuring knowing that the needle is full of vaccine and not something else (like saline/water). The rubber tops should be sterilised with an alcohol wipe before the vaccinator goes to draw up. One draw at a time, no resheathing needles. If the patient decides they don't want it after you've drawn up then it's supposed to go straight into the sharps bin. I think at that point it should be okay to give it to the next patient to reduce waste but I get that the guidelines and protocols are there for infection prevention and control, also health and safety.

If you draw up with the wrong needle then that dose is void and goes straight into the sharps bin. Don't mess around with the needle after you've drawn up, that's a big risk of infection for patient because the needle is no longer sterile.

It's goes sorta like this: Patient is called over.

Confirm their identity and make sure patient information is correct.

Patient is asked a series of questions.

Nurse/vaccinator makes a decision whether they are eligible for the vaccine (not allergic to ingredients, no history of adverse reaction to vaccinations, not pregnant - if they are they are to consult their midwife or GP first then come back and get the shot, no covid in the last 4 weeks, no vaccinations in the last 7 days, no contraindications).

Nurse goes through symptoms and side effects and how to manage them if you get them.

Nurse asks for consent to give the jab.

Nurse draws up the needle.

Nurse gives jab.

Patient is given information about the vaccine and is asked to wait 15 minutes in the waiting area to be observed (time yourself, after 15 minutes if you feel okay get up and go).

Edit: spacing, am on mobile.