Rookie mistake!
I'm a late in life bandmember. I joined an established band a few years ago but due to a chronically unavailable lead vocalist we'd only performed twice before this past week. With our new vocalist we performed on Friday and we have a half dozen shows lined up this year.
So, all good. Except my more experienced bandmates forget that I don't know anything about performing, soundchecks, etc.
I managed to make enemies of our opening act by not moving my equipment off the stage prior to their soundcheck. I didn't know!
EDIT: by “my equipment” I meant a bass on a stand and a tiny pedal board. Opener was backlining my amp. Which they insisted on moving anyway.
So this is a plea to the experienced people out there: help us newbies with the basics. Remember that we don't know anything, and the pre-show nerves make us stupid when it comes to this stuff.