It's always a better idea to make a reservation if you plan on visiting a popular shop or dine at a well-known restaurant during your tour.
When making reservations, you will normally need to provide your name and contact details as well as the date, time, and number of people expected.
More stores and restaurants have been using either their websites or gourmet sites to accept reservations online.
Your hotel can make a reservation on your behalf if the shop or restaurant only accepts phone reservations in Japanese.
You may sometimes need to specify the course or menu item, and/or choose among tatami chair seating or private room when making a reservation.
In general, stores and restaurants do not charge reservation fees.
As a courtesy to the establishment you are visiting, honor the time and number of people agreed upon during your reservation.
Contact the store or restaurant beforehand if there are any changes to your reservation.
It is also considered good etiquette to inform the restaurant beforehand when you need to cancel.
Note that many popular restaurants and even casual noodle shops do not accept reservations.