Wouldn't hurt too much to do a complete inspection each time in the beginning. People say it disrupts the bees and yea it does somewhat, but you learn whats going on. After some time you can take shortcuts as you gain experience. Frequent and complete inspections can give you a familiarity with the temperment and mood of your hive. Just be gentle and go kinda slow and be deliberate. They feed off your mood too. If what you're doing is for the good of the colony, then you will be on the same page.