Be patient.
Allow extra time both for conducting and reporting your shops.
Don't overextend yourself.
File your reports timely.
Shop the correct address on the correct day/time.
Read the guidelines and questionnaire, if accessible, prior to conducting your shop.
If you run into an unforeseen delay, contact your scheduler.
After you file your report, check back for several days on the reporting site as well as your email to see if you are being asked for further information.
Have fun and enjoy the ride!