You probably won't have to go through the whole process with each store after doing it with the grocery store, maybe for the walmart
because it is a really busy one but, honestly, after a while, you will be able to do it. So what
if you have a panic attack for the first few times, it won't kill you and you will feel a sense of accomplishment that you were able to do it no matter how hard it was. As I always say, don't forget to reward yourself for your success, either.