I am a paying customer of Odoo but their support refuses to help as "it is self hosted", so while learning, my only way is this forum. 

I have the Appointment form working on the site, yet I would like to remove the "phone number" mandatory field. Unfortunately, there is no documentation on this specific feature, and I cannot find any way to edit:

- That specific form (other than adding custom questions OR editing the source HTML file which surely cannot be the best way to do this)

- Also the email template can nowhere be edited (the emails sent for reminders)

- I can by the life of mine not find a way to notify both user and myself upon an appointment _creation_ (only notifications are "N hours/days before the meeting" which is just not how an appointment flow should (and does) work in all other providers such as Calendly or whatever else).

Can anyone help me with these problems? Thank you kindly.