Trim roast and slice into 1/4 inch thick pieces. Put directly into crock pot (or baking pan).
Combine spices and toss into crockpot.
Add in the vegetable oil. Yes, it is a lot of oil, but fear not. If you skimp you won't get the same results.
Toss together using hands until evenly coated with spice and oil goodness.
Cook on low setting for 6-8 hours until the meat can easily be shredded with a fork.
Video
[yeetvid]
Notes
TO CRISP ON THE STOVE: Heat a large skillet over medium high heat. Work in batches and use tongs to place the shredded meat into the pan and saute until crisp, about 3 to 5 minutes. The meat should still have oil on it from the slow cooker.
TO CRISP IN THE OVEN: Spread shredded carnitas out onto a baking sheet in an even layer. Place under the broiler setting in your oven for 3 - 5 minutes until crisp.