To assemble a fajita: Spread some of the guacamole on a tortilla, top it with a few slices of the steak, some of the pepper mixture, and some of the salsa, and roll up the tortilla to enclose the filling.
To warm tortillas: In the oven:Stack 6 tortillas at a time, wrap each stack in foil, and heat the tortillas in the middle of a preheated 325°F. oven for 5 minutes for corn tortillas and 15 minutes for flour tortillas. (If the tortillas are very dry to begin with, pat each tortillas between dampened hands before stacking them.)
In the microwave:Stack 6 tortillas at time, wrap each stack in a microwave-safe plastic bag, and heat the tortillas in a microwave oven at high power (100%) for 30 seconds to 1 minute, or until they are heated through and pliable.