Open the tortilla press, peel off the top piece of plastic, and then take the tortilla on the bottom piece of plastic next to the comal, so that you can pass the tortilla to one hand as you remove the bottom plastic with the other hand and quickly but gently lay the tortilla on the hot pan. Don’t worry if it isn’t perfectly flat (you’ll get better as you practice), and don’t try to move it, which will cause it to tear. Return the piece of plastic to the bottom of the tortilla press.
Cook the tortilla until it releases easily from the pan and its color has lightened and become opaque, 40 to 45 seconds; you don’t want the tortilla to brown or become freckled at this point.
Using a spatula or your fingers, flip the tortilla and cook it until the bottom starts to brown and freckle, 70 to 90 seconds more.
Flip the tortilla one more time and cook it until it puffs, 10 to 15 seconds. If the tortilla doesn’t puff on its own, gently poke it a few times near the center. Once it puffs, let the tortilla cook for 15 seconds longer, until fully set and soft.
Remove the tortilla from the heat and wrap it in a clean kitchen towel, or transfer it to a cloth-lined tortillero.
Repeat the pressing and cooking process with the remaining dough.