When on location, regardless if you are just shooting for fun or on an assignment, be prepared.
Especially on an assignment this is important, those you are shooting for are expecting a certain result and in most cases how you arrive at those results is of no difference to your client.
Even if you are shooting for yourself, having some ideas of what you want to shoot and how can save you a lot of time in the long run.
Take some notes with you, copy in a few sample images on your phone for ideas or reference, preset your camera and so forth.
Try without knowing
Sometimes you see an image where you have absolutely no clue as to how the person that took it achieved that result.
Right there is a perfect time to go out and try for yourself and figure it out without googling it beforehand, often you can end up with results much better than you had anticipated.
Shooting through experimenting is a really powerful tool, and it helps you learn your camera quickly and not to mention discover new things.
It contradicts the first tip, but I think it is very important to have a healthy mix of both for the right times.
If you get too hung up on technical things it is quite easy to forget your own artistic vision in it all.
Use your imagination and your creativity, not others.
And the end of the day you either get your ass kicked, or you KICK ass.
Have a superb day.