The key to staying invisible is simply to act as naturally as possible as if you have as much right to be where you are as anyone else.
If you come across as being nervous, agitated, stressed or look as if you have something to hide, you will stick out and people will remember you for the wrong reasons.
Acting as naturally as possible as as a normal customer would act is key to being an expert mystery shopper.
The whole point of mystery shopping is to evaluate a situation as a normal customer would experience it.
Do not try and catch someone out.
Do not be a difficult customer.
Stick to the guidelines you have been given, ask the questions you have been asked to ask.
Stick to your scenario and remember to rehearse your questions and answers in advance in case something unexpected happens.
Write your notes as soon as possible, even if just in a note book.
I usually make notes on the back of the receipt as then everything is in the same place.
Sometimes your notes will be useful if you need to clarify something.
Always note the time of entry and exit and the surrounding buildings to make sure you were in the correct location.
Some retail outlets might have multiple outlets on the same street or town.
If in doubt, check in advance.
Sometimes the assignment will require you to ring in advance, make sure that you read your guidelines correctly and follow all the steps.
Timing is essential.
An assignment may require a particular time slot or day of the week or it may preclude a particular day of the week.
If you are shopping in a high end retail outlet, remember to dress as if you could afford to shop there.
If you are shopping for trousers or shoes, wear clothing that is easy to remove so that you do not spend most of the shop lacing up boots or wrestling with zips and fastners.
Have fun! Remember all that you are required to remember.
The better you get, the more work will come your way.