Soak 1 rice paper sheet in a dish of warm water until soft and pliable (don't soak the sheet for too long or it will tear). Transfer to a clean work surface. Place 1 heaped tablespoonful of the noodle mixture along the centre of the sheet. Fold in the sides and roll up tightly to enclose the filling. Place, seam-side down, on a baking tray and cover with a damp tea towel. Repeat with remaining rice paper sheets and noodle mixture.