I think that there's a general rule if you want to find a plastic surgeon and that is by researching, asking previous clients and asking their previous clients. You can also look at their sites and ask your local health bureau for the plastic surgeon's medical records. Through this, you will have options and this also goes to other parts in the world.
Well if you plan to go to Mexico, you can easily check if your surgeon is certified, go to AMCPER - Asociacin Mexicana de Ciruga Plstica
This is the mexican asssociation for plastic surgeons, if they are certified, they are listed here. If not, RUN AWAY!!!!
There are many excellent surgeons in Mexico, giving extremely natural results.