You don't have to apply the same standards of grammer to review notes that you apply to a term paper. The basketball player who refuses to shoot until the perfect shot is available may never shoot. If you can complete a job 95 percent perfect in two hours, and 100 percent in four hours, ask yourself whether the additional five percent improvement is worth doubling the amount of time you spend. Sometimes it is a piano. A tiny mistake can ruin an entire lab experiment.
Computers are notorious for turning little errors into monsters.
Accept lower standards where appropriate, especially when time is short. Notice when time passes and you haven't accomplished what you planned. Take a minute to review your actions and note the specific way you wasted time. We operate by habit and tend to waste time in the same ways over and over again. When you have noticed things you do that kill your time, you are more likely to catch yourself in the act next time.