Take your time. Get there 30 minutes early every time. Ask the customer to let you go through once alone. This will allow you to work without dealing with your clients at the same time. That will come in time. After you are comfortable take them through. Look at the house as if it were a crime scene. It usually is. Every problem has a cause. The cause is more often more important than the problem. The fix is something you want someone else to do. Take your time. If they distract you be honest and tell them you need alone time. And take pics of everything. Then when you get home you can look at areas more closely. We have all found defects missed during the inspection in the photos afterwards. And save all your photos to CD and label them. You will need them at some point in the future to save your ass! Even the ones not used in the report.
Good luck and welcome to the club.