Salt and pepper turkey legs very well on both sides. Then sprinkle both sides with chiles de árbol. Place the legs in a brining bag (or a very large Ziploc) and sprinkle with herbs and lemon zest strips. Seal bag and chill overnight in your refrigerator.
Preheat oven to 250º. Remove the turkey legs from refrigerator and lightly brush off excess salt and herbs.
In a 5-qt. pot over low heat, melt duck fat just until melted and warm. Add the turkey legs to the pot making sure they are completely submerged.
Place the pot in the oven and cook for about 3 - 3 1/2 hours, until turkey legs are tender and a knife can easily be inserted into the thickest part of the thigh. Then let turkey cool in the duck fat at room temperature, about 2 hours. Cover and chill overnight.
Confit can be made 3 days ahead. Keep Chilled.