Do not overstuff your spring rolls. Just don't do it. It will make you crazy. You don't want them too thin but overstuffed is just a mess waiting to happen.
Place the rice vermicelli in a large bowl. Pour hot tap water overtop to completely submerge.
Let stand around 10 minutes or so. Check. You want them a little chewy but not hard. They are probably good to go at this point. If they aren't let them soak another minute or two. Drain and rinse under cold water.
Prep your ingredients. Stem the mint leaves and cilantro. Have your lettuce and shrimp at hand. If you are using carrots or cucumbers keep them close as well.
Fill a large bowl with warm(almost hot) tap water. Not as hot as it goes but pretty warm.
You are making little rice paper burritos. Think about it like that. You want to be able to fold the ends over and then roll them up. Just like a burrito. You have to move fast. Make a couple practice rolls before you start adding the shrimp.
Put a lettuce leaf flat on a cutting board. Put a little rice vermicelli on top. Now add a few sprigs of cilantro (be generous) and roll it into a little lettuce cigar. You want it about 4-5 inches long. Set it to the side of the cutting board.
Top with julienned carrot and cucumber.
Dip a rice paper sheet in the warm water for about 2-3 seconds. It will still be firm but that's OK. Lay it flat on a cutting board. Place a couple mint leaves about a 1/3 of the way down from the side furthest away from you. Arrange the shrimp around the mint. Make sure the cut side is up.
Place the lettuce cigar in the bottom third . Carefully peel up one side (your left or right) and fold it over the filling. Repeat on the other side.
Peel up the side closest to you. Place it overtop the lettuce wrap. Now roll the whole thing away you. Be careful. The rice paper sheet will be very soft by this point. You want to start fairly tight and then relax as you roll over the shrimp.
Do this without the shrimp a couple times. It will come. Just be patient and deliberate. Once you hit your rhythm start making them with shrimp.
Serve the rice rolls with the peanut sauce to dip or drizzle.