Is sushi so difficult?
Like many crafts which originated in Japan, their sushi training more or less creates sushi artisans.  If you just want to make a snack, you'll have plenty of ability given a basic review of techniques.  You should focus your learning on understanding food-safety, getting the rice right, and making the roll not fall apart.  The rest is just levels of mastery which you need not approach in your kitchen in order to experiment and enjoy a good dish.