Leave your wallet and phone at home, comb your hair and shave. Dress like a decent, well-educated middle class boy with a good upbringing. So, a clean shirt and casual pants. Put on some cologne.
I make a shopping list. It helps me remember what I need and it looks super legit to others if you walk around with one. Surely no thief would use a shopping list?
I use my backpack to collect all the goods. Most people just look at me and think I'm a regular college student using his backpack to shop.(which isn't entirely untrue, haha)
Before entering the store, walk around the surrounding area and plan an escape route. An escape route should have a lot of short streets and corners so in case someone is following you you can quickly shake them off. So no long streets where they can still spot you when you're out of breath.
I've only been chased twice though and that was years ago, most employees will not chase you but having an escape route planned is:
a. Just common sense
b. Good for courage/confidence inside the store. Being prepared feels good.
When you enter the store, take out your shopping list.
Now comes the crucial part. Shoplifting is all about ignoring your dominant impulses.You must repress the urge to look around you like a paranoid peter. I've seen plenty of people get caught because they behave all jittery and scared, which of course is a natural way to behave when you're aware that you're taking a risk, and doing something illegal.
But nevertheless. The majority of shoplifters get caught because they're behaving suspiciously. Only a small percentage actually gets caught red handed.
Take the item, look at the price, just take off your backpack, open it, and put it in. ACT LIKE YOU ARE JUST SHOPPING. Act like the rest of the customers.
Repeat this, walk around the store with your shopping list, and act natural. When you want some meat, compare different meats, take some time, but not too much.
When you have your goods, take something small to buy. I bought two sandwiches. They cost me 90 cents. Go to the cash till, and if there are multiple, seek out the youngest female cashier. Older, experienced ones are more likely to ask you to open your backpack.
I sometimes do a little smalltalk with the girl at the cash till, I actually did so today. It works charms. Standing there, look around with a bored look and make sure no employee is hurrying towards you. If you're being paranoid, try to stay cool and make sure the employee hurrying towards you is actually after YOU. If so, walk calmly past the cashier, head in a hurried pace towards the exit and once you're out, run like a nigger.
This is as much as I can tell you, the rest of the act you will learn from experience. I was vey anxious my first few times, I believe I was 15 at the time.