Get your tomato sliced, some leaves of lettuce pulled off the head, then fry up your bacon, figure 4-6 slices per sandwich. and while the bacon is frying, slice up some cooked chicken or turkey, roasted would be preferred but is not a show stopper. When the bacon is nearly done, toast the 3 slices of bread but let them cool for a few minutes before you start building the sandwich.
Lay the 3 slices of toasted bread out in a row, spread some mayo on each slice. On EACH of the first two slices, place 2 or so lettuce leaves, crossing each layer, keep it neat, no stuff hanging over the sides of the bread, then place some tomato slices to cover the lettuce, season with salt and pepper to your liking. Now place 2-3 slices of crispy fried bacon over the tomatoes, again, no sloppiness, break up the bacon nothing hanging out, then place some sliced chicken or turkey over the bacon, season with salt and pepper to your liking.
Pick up the first slice of bread and set that on top of the second one, now pick up the third slice and place that third slice, mayo side down on the top, almost done.
Insert a long tooth pick or cocktail skewer in each place where you see the red dots, then after that, cut the sandwich along where you see the dashed lines, cut the sandwich in half, then cut each half in half, done. Serve with a pickle and some potato chips or fries, you have a lunch or light dinner.