It's nobody's fave. Count on doing it twice. Per door. The first time just familiarizes you.
Set your expectations low and take it easy at every step, taking lots of breaks if you can.
Be sure to mask or secure or otherwise protect the drop glass at certain points so as not to scratch it. When you learn how to get it out and back in you will have new respect for the blokes who built it. But not for the blokes who designed it.