Open your booking page as a first-time customer and stop just before confirming.
Can you tell how long the appointment lasts, which time zone applies and what the customer is agreeing to? If a deposit or cancellation condition applies, it should be visible before that decision.
Before you redesign your website, pick one customer task it should make easier.
Open your current site on a phone. Try to find a service, understand what is included and send an enquiry. Note where you hesitate or have to guess. Keep private customer details out of screenshots.
Choose the music after you know what your product video needs to explain.
A calm booking flow needs room for the viewer to follow the cursor and read the confirmation. A fast product launch can use a stronger beat, with movement timed to the moments you want people to notice.
Before you commission an app, write one thing you should be able to test at handover.
For a booking app, that could be: a customer chooses an available time, gets confirmation and can see the booking again after signing back in. The owner should see the same booking.