How to shoot in The Binding Of Isaac

So, first of all, you need to get your setup into a big golden chest in which you can fit and play (it won't work without that, trust me bro), then you roll a dice inside the chest, no matter what it rolls into, you can process to the third stage.

Now, the hardest and the last part, I have to type its own steps:
1. You grab your mouse.
2. You realize you don't need it.
3. You let go of the mouse.
4. You place your fingers on the keyboard.
5. Make sure your fingers are on W S A D and arrow keys.
6. Cry.

Now, you're all good to go! Have fun gamers!