Breast fat grafting side effects

Is breast fat grafting a method of removing fat from another part of the body and transplanting it to the breasts?

In that case, I think removing fat from other areas might also be somewhat painful, but I'm not sure.

Are there any side effects? I heard that inserting implants in the past had some minor and major side effects.

And I am also curious if it is true that breast fat grafting, unlike implants, causes the breasts to shrink somewhat over time.