Copying and pasting instructions I wrote down in the video description:

1. Get to the subway on a FRESH FILE.
2. Go to the typewriter for A/S/HC, NG+, Knife Only, Pistol Only or to the herbs for NM/Inferno.
3. Reset IGT back down to 0 using the Ultimate Trainer.
4. Let timer run unlocked after setting IGT to 0 for 15 seconds.
5. Lock the timer and set it back down to 0.
6. Make your save in correct spot using either the typewriter OR the trainer itself.
7. Close the trainer and test.

MAKE SURE YOU DON'T PICK UP ANY ITEMS BEFOREHAND. DO NOT MOVE ANYTHING IN YOUR INVENTORY BEFOREHAND. DO NOT MAKE CONSECUTIVE SAVES. If you screw up in saving you need to go back to the subway on a fresh file before trying again.

Set DA for the following categories:

-Assisted: 2500 -Standard: 5500 -Inferno: 11500 -Hardcore and Nightmare should be at 9 and 10 rank respectively, neither higher nor lower.

That's it! Have fun, guys.