Once you get past the strange (but really clever) ordering system, Which Wich makes for a really yummy sandwich. It's not hard and once you get it, it makes a lot of sense.
Step 1. Figure out which protein you want in your sandwich. Pork, Turkey, Beef, Chicken, etc.
Step 2. Grab the appropriate bag and a marker.
Step 3. Work your way down the bag, x'ing off which cheese you want, what sauces you want, what veggies you want, hot or cold, extra meat. All of that is SO FLIPPING CLEVER. And you do it at your own pace.
When it's done, write a name at the bottom. Now, you could be normal and boring, writing your own name. Yeah, that's been done. But be outstanding and put something smart like "Voldemort" or "Darth Vader" or "Bruce"!
A few minutes later, your sandwich is ready. Exactly as you ordered it and wrapped up ready to go. Love it!