Lay out the tortillas on a work surface. Divide the guacamole amongst them, and spread it over them. Sprinkle them all over with shredded lettuce, divide the shrimp amongst them, drizzle with a bit of olive oil, and season with salt and pepper.
Roll them up tightly, secure with toothpicks if needed (though warn your guests about the toothpicks), and cut into halves or thirds to serve. Serve right away.
Buy or make the guacamole. You'll want about 2 cups (16 oz / 450g).