You haven't been around us long enough. No stupid mistakes here, no sir...
Good thing about Q in a CS, "most" of your mistakes you can eat.
Not stupid buying a flat, just a little more picky. Take a peak after it hits about 170 internal. If it looks like the edges are drying out, take it and wrap it in foil to hold some moisture in. Sometimes I'll spray it with a little beef broth for moisture.
Just keep an eye on it and learn to "see" what it's telling you.
Keep really good notes. Hard to repeat the good ones if you don't write it down, and it's certainly easier to make mistakes again if you don't write them down too.
Smokin'