This is a very common question. During the surgery patients are sedated so they feel no pain at that time. Post surgery there will be some pain during the recovery time, but patients are given pain killers to help with this. How much pain a patient experiences is subjective and depend on the patients pain threshold.
Breast augmentation implant surgery DOES hurt but it varies from patient to patient. I have had some patients take only Tylenol while others have been on potent narcotic analgesics for 6 weeks even when the same procedures were performed.