When you’re at home, sushi etiquette is at your own discretion, but here are some recommendations for behaving in a sushi restaurant.
When you arrive at a sushi restaurant, greet the host or hostess. If you are interested in food preparation, sit at the sushi bar to be nearer to the chefs. Otherwise sit at a table.
Only order sushi at the sushi bar, order anything else from the menu (including soups, drinks etc) from a waitress.
Respect the sushi chefs (itamae), as they are quite busy. They usually love to chat and have been known to accept a beer or saki (only in the evening). Always complement highly as this may lead to great sushi rewards either later that meal or on a return visit. Be mindful though, that itamae have traditions that date back to the time of the Samuai.