Do cardio throughout the year at least three days a week for at least 30-40 minutes, whether it be first thing in the morning on an empty stomach or after a post-workout protein shake. Cardio won't kill your gains as much as you think; you'll see how much muscle you really have.
When it comes to personal appearance, people are quick to cast judgment on people who look better than them. It's part of the human inferiority complex.
My first bodybuilding competition was the 2003 NPC Northern Colorado, where I was a light-heavyweight weighing in at 192 lbs. I was very nervous, as it was my first real-life experience being a bodybuilder.
There's no way in hell I could have achieved what I have without being a good student and listening to the wisdom of others who have been doing this a lot longer than I have.