Add about a third inch of water to a large shallow dish to dip the rice paper wrappers in. Dip one sheet of rice paper wrapper in the water for two seconds and place it on a flat surface. (see Note 2)
Starting with the side closest to you, add the mix greens/lettuce and shredded red cabbage on top of the rice paper wrapper, leaving an inch of wrapper on the edge to grab ahold of later. This will provide a barrier between the vegetable filling and the delicate rice paper wrappers.
Next place the peppers, carrots, tofu, and avocado on top of the mixed greens. Finally add the vermicelli rice noodles and fresh herbs on top of everything. You should have a stack of the filling piled on top of each other.
(Optional) For presentation: if you prefer to see the colorful vegetables through the wrapper, lay them flat on the rice paper wrapper in the center. As you're rolling it up, you should be able see the vegetables through the rice paper.
Starting from the end closest to you, pick up the inch of wrapper left uncovered and roll it up a quarter of the way.
Continue rolling until all the filling is rolled into the rice paper wrapper.
Fold the left and right side of the wrapper towards the center and continue to roll it all the way up.
Place the summer roll on a plate and let it sit for 1 minute or until the wrapper is no longer tacky. The surface should still feel soft and pliable but it should not feel sticky since the excess water should be absorbed by now.
Cut each summer roll crosswise into about 2 inch pieces and arrange them on a plate. Serve with the peanut, hoisin, and Vietnamese dipping sauces.