Take a sheet of sushi seaweed and place it on a sushi rolling mat, shiny side down. (healthynibblesandbits.com)
When rolling, it makes the process A LOT easier if you have one of these bamboo rolling mats so you can shape the rice a little better. (dellarice.com)
To do this, I use a silicone rolling mat and rectangular steel pieces under my rolling pin. (eugeniekitchen.com)