If you are using mushrooms or meat as a filling and need to cook it first, you might want to start with that so it has time to cool. Cook the meat/mushrooms the way you want.
Thinly slice all the vegetables and set aside.
If you want to add any sauces etc. they must all be ready in front of you (you may want to use hoisin sauce, Sriracha or others.
Make sure you have a work space/board where you can place your damp kitchen towel to work on.
Boil some water and place the rice noodles in a round fairly large bowl, add the water.
So essentially now you should have little bowls with all the veggies in, a bowl for dipping the rice paper rolls, a bowl with the rice noodles and your damp cloth work surface.
Once your prep of the veggies, sauces, meat is ready as well as the damp towel to work on you can start.
Taking one rice paper at a time, dip into the water bowl (a few seconds) spread it out on the damp towel, add your fillings (not too much or it can't close neatly).
Roll half way, once more roll, tuck in the sides and your fist ones done!