Simpleton,
There are several ways to do a Plastic & Reconstructive surgery career.
1. Combined/Integrated programs which you apply for as a fourth year student. These consist of various types of setups with 3-4 years of general surgery and then 2-3 years of plastic surgical rotations. Some programs have special schedules for their residents during the preliminary years, while others mix you in with the gen. surgery residents
2. Traditional fellowships which require a minimum of 3 years general surgery or a completed residency in ENT, oral surgery, Neurosurgery, Orthopedics, or Gyn Onc (believe it or not).
There has been an increasing # of integrated programs due to financial pressures (its cheaper for the depts. b/c the feds kick in more for the cost). Most of the traditional spots are taken now by 5 year gen. surgery residents with much lower rates of success for abbreviated surgery training candidates & among the other eligible specialties.
Board scores, research, medical school, & prerequisite training all play huge roles in whether you will be accepted. If you know as early as you do this is what you wish to do, you MUST do well in med school from day 1 & plan on doing some kind of research project to be competative.