Overview
Don't be afraid to look for (and find) mistakes in your work -- after all, isn't it better to discover something that you did wrong yourself, rather than have the big boss or teacher discover it? Sure, it might require more energy or time to proofread or double check something, but instigating a positive change is always worth the extra effort. You need to build a reputation as someone who gets it right, not just someone who gets it done on time.