I'm trying my hand at making my own tortillas. I've made flour ones with no problems. Easy, tastes delicious, and plays its role of wrapper for the stuff I put in the taco. Corn tortillas? I've tried a few times now and cannot get them right. I start from masa harina (from the Mexican store) and mix it with salt and water. I've tried adding a little oil as well. I then adjust for the right texture (not too sticky, not too crumbly), form balls and use the tortilla press twice to get them thin enough (they still end up a bit thicker than I'm used to), then cook them in a stainless steel pan (all I have access to at this time). Two problems: 1) They do not puff up like I see explained in recipes or videos (for example see the video below starting at around 4:20). 2) They tear up when you try to eat your taco, and all the filling end up in my plate (in my case) or on the floor (in the case of my kids). Any idea?