I'll tell you the details of the date. Usually you can get it one day after making an appointment. However, if it is Friday, it won't be available until Monday. If it is Saturday, it is equivalent to making an appointment for Monday, so try not to make an appointment near the weekend.
Then, if you have made an appointment, you can go to the outlet to exchange it, get your ID card, take the number and fill in the form (a blue exchange memo signed in the lower right corner, and a foreign exchange purchase memo filled in with the above four lines of information and signed in the lower right corner), and that's it.