I do self exams monthly, my surgeon showed me what to do. My gyn does them when I see her. I told her I have implants, and she checks accordingly. To be fair, I have saline under the muscle which makes it a little easier because you can move them around a bit more and feel the actual breast tissue.
Just don't hide the fact you have implants from your doctor, and make sure you tell them what kind. If they're worth the money you pay them, they'll know how to do an exam on a woman with implants.
Also, you can watch some videos on the internet too
http://www.medicalvideos.us/play.php?vid=2648