Always be willing to ask questions, because it is one thing to learn how to do one of the procedures that are part of your job, but it is a totally different thing to understand the basis of each step and the purpose it's done. This will not only enrich your experience but also help you later be able to apply the skills you learned at this job to another job. Additionally, there is no such thing as a dumb question. Nobody laughed at me for asking anything. As a matter of fact, they were all happy to explain.