Confidence and hustle are king...not arrogance, but confidence when blowing the whistle. I guess I could say not second guessing yourself when you do blow the whistle. It comes with time I guess....Don't blow the whistle and look at your P for what to call (as I've seen some young and upcoming guys do
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Early when I started I had a weak whistle...a vet I worked with told me to "Blow the whistle like I was in Conseco Fieldhouse". So I began putting more air in it and now if I were in front of 20K fans, the guy in the top row would hear my whistle (if I'm in that gym)
HUSTLE!...Get in position and if you get beat on a quick turn, get yourself back down court. I've found that hustling to be in the right position has kept me out of trouble...The coaches and fans (not that they matter) see you working your tail off and there have been times when I was not in position and got chewed on by a coach for the call or lack of it...but when I did hustle and put myself in position it kept the coach off me because he knew I was there and had a good look.