Exchanging one implant for another is not always complicated, but it is also never as easy as changing a tire. If your breast skin and tissues are in good shape, and you are not changing the size of your implant, I can most likely go in through your original incision and do a simple swap. But if you have gained or lost weight, had children or gone through menopause since your original implants were placed, there is a good chance that your skin and tissues have stretched. This means that you may need a breast lift in addition to your new implant. Without assessing you in person, it is impossible to say for certain.