Oh, yes (as Churchill says). I know exactly what you mean. I feel like I don't do my best because I know the industrial partners need my results quickly. I envy those postgrads who have 3 years to develop methods. I really worry about sending out incorrect data, because of my inexperience and the speed at which I have to work.
I've learned that honesty is by far the best policy. Generally people don't mind if you make a mistake or take longer than expected, as long as you keep everyone informed. Sometimes you get good advice too, so it works both ways.