Fill a large shallow dish with warm water and set it nearby. Prepare all your fillings by julienning carrots, slicing cucumber, and chopping herbs. Cook and slice shrimp if using.
Submerge one rice paper sheet into the warm water, gently swirling until it becomes soft and pliable, about 10-15 seconds. Carefully lift it out, letting excess water drip off, and lay it flat on a clean surface.
Place a small handful of cooked vermicelli noodles near the center of the rice paper. Arrange a few julienned carrots, cucumber slices, fresh herbs, and optional shrimp on top of the noodles.
Fold the bottom edge of the rice paper over the fillings, then fold in the sides, and gently roll up from the bottom to seal everything inside. Repeat with remaining rice papers and fillings.
Arrange the finished rolls on a platter. Cover with a damp towel if not serving immediately to keep them fresh and prevent drying out.
Serve the spring rolls with a vibrant dipping sauce, and enjoy the crisp, refreshing bites with every chew.