Do you have to get anything injected before getting breast implants?

Yes, you will need an IV but this can be done with minimal discomfort. See link below for examples. 

Everyone undergoing breast
augmentation surgery requires an IV. This is required for several medications
(needed to sedate you and/or put you to sleep for the surgery), antibiotics,
and fluid hydration. There are several ways an IV can be placed in patients who
have a fear of needles. Most of the time a topical anesthetic cream can be
applied to the skin to numb the area, and an oral sedative can be given to help
relax the patient. I would not let this fear prevent you form having surgery.
Speak to your plastic surgeon about your concerns so they can make this portion
of your experience as smooth as possible. Best wishes.

Great question.  When undergoing general anesthesia, it is necessary to start an IV before hand so the anesthesiologist can administer medications, so you will not feel the surgical procedure.  You can get a prescription for a relaxing medication to have on board that morning before you have the IV.  You can also get a topical cream to numb the area that the nurse can put on 30 minutes prior to IV.  Also, the anesthesia office will call you a week or two before your surgery to introduce themselves, and ask questions about your medical history. This sometimes alleviates some of the anxiety associated with anesthesia, and steps involved the morning of your surgery.  I hope this has helped.  Best wishes. Look at our video from our chief anesthesiologist describing anesthesia for comsetic surgery