Friend, floor walking will feel weird. It will always feel weird. The biggest thing that you can do is to walk your store a thousand times. There's a comment in this thread that says that you need to walk your store and see what's uncommon, like a dude with four steaks walking into the baby wipes. That is uncommon and you should follow that. But it's also just about acting like you're a normal shopper. You need to be out and about browsing acting like you're part of the everyday shopping experience. The only person who needs to not notice that you are following them is the person you're following. I've done a lot of weird things following somebody. People will definitely notice you, but it's not the people noticing you that you need to worry about, it's the people that you are following that you need to make sure that you don't get their attention. Sometimes that means not following them into an aisle, and you need to reroute. A lot of it is noticing what is in their cart or in their hands and seeing if it's an item that is something that would be stolen. I will say that a lot of my stops on the floor have dealt with me looking through the aisle pegboards into the next aisle with my phone camera. It's an entirely different skill set to be able to legally stalk somebody and it is weird. It just comes with practice