Cook vermicelli per package instructions. Drain and rinse cold. Set aside.
Prep all fillings and arrange within arm's reach before rolling.
Whisk all peanut sauce ingredients together. Add warm water gradually until smooth and pourable. Set aside.
Fill a wide shallow dish with warm water.
Submerge one rice paper for 15–20 seconds until just pliable. Lay flat on a damp board.
Place filling in the bottom third — noodles, protein, vegetables, avocado, herbs. Do not overfill.
Fold bottom edge up over the filling. Fold in sides. Roll tightly upward away from you.
Place seam side down. Repeat with remaining wrappers.
Cover finished rolls with a damp cloth while working.
Serve immediately with peanut sauce, lime wedges, and extra herbs.