Right on the money. Your experience in the lab will be a combination of what you make of it (25%) and the quality of your lab mates (75%). To be a successful volunteer/student, pretend that you are going to be a student chef. It takes many years of experience to be a really good scientist, and you aren't going to learn even a handful of the tricks that professionals use over your summer. All you need is to have good hands, get along with your lab partners, and have lots of patience. There is a lot of hurry up and wait sorts of things that can be frustrating for someone new to the game. Ask questions, be curious, but be humble. Be enthusiatic but back off with the questions if you sense you are annoying someone. Do not attempt to thrill us with your genius; learn from those who are competent, and once you get good, you can THEN innovate and develop your own techniques. But not before then. We've seen far too many students who think they are too smart to be bothered with mundane techniques, and never get a single experiment to work. Above all, have fun.