I have had cysts in my breasts for 15 years, off and on. Some large, some very small, some hurt, others don't. I have also had them drained a few times, and to me it was not all that bad. I have had them drained in the gyne's office and also at the hospital with ultrasound assistance so they could see what they were draining. The first time I had it done, the doctor asked if I would like him to numb the area first but I chose to just let him drain them. He simply felt for each cyst based on the US results, and inserted a needle with a syringe attached and sucked the fluid out. It was no worse than getting a shot. When I had it done at the hospital with US assistance, the cyst they were draining was very deep and hard to reach so it was more painful.
I was told by my gyne that it is not necessary to drain a cyst if it is not bothering me. I only have them drained when they begin to interfere with sleeping comfortably or if I have a lot of pain from them. I am seeing my gyne next week, in fact, to see if he will drain a couple that I have right now that have grown in size and are bothering me. This is a different gyne due to insurance changes and we have not yet discussed how he would treat cysts, so I am hoping he will drain them himself and not make me have a surgeon do it. If he does insist on a surgeon, I will enlist the one who recently did several surgeries on me since I am familiar with him. Either way, to me it's not something to stress about, just something that is more of a nuisance.