I’ve heard it’s rather simple in the case of BMWs because they usually have garage opener buttons on the rearview mirror. My car has them, and it took less than five minutes to adjust.
Maybe it’s also because of the doors. Mine are from
doorsdirect2u.co.uk, and they were really easy to adjust and install. That’s why I like to work with this company - they are always quick and do their job good.
Another thing I like about these doors is that they have windows, and the sunlight can get inside and make the garage look better. And wooden doors fit the house’s design way better than plastic ones.