A major take-away is writing the way you enjoy, I feel! There are certainly many things that can throw me out of a fic and admittedly first-person POV is not usually my go-to, but I'm often willing to give it a try if it's in a story that appeals to me. Also, especially in my earliest days of fandom, there did seem to be a lot of people I would run across that would feel like they were too shy to write because of options of how someone ought to write (or the popular pairings, etc). I always emphasize that people should do what they enjoy!