In a large mixing bowl, combine the flour, salt, and instant yeast. Then add the olive oil and water. Stir to combine, then knead with your hands (or use a kitchen machine with a dough hook) until it's a smooth dough. If the dough is too sticky, add more flour; if it's too crumbly, add more water.
Coat the ball of dough in a drizzle of olive oil. Cover the bowl with a clean kitchen towel and let it sit in a warm place until the dough doubles in size (for about 2 hours).
Divide the dough into 4 equal pieces (about 100g each). Roll out each piece on lightly floured parchment paper.
Put one tortilla in a very hot (!) large non-stick pan. Once the surface is bubbly, you can flip it. Let it cook on the second side for 1-2 minutes max. Then place it onto a kitchen towel and cover it. Add all the other tortillas to the stack in the kitchen towel as they get ready. The steam will help make them more flexible and keeps them warm.