Has any member had experience with installing these?
It seems fairly straightforward ; cut the appropriate oblong hole in the ceiling between joists then make sure there is a cross piece between the joists at each end of the hole. Get a mate to help lift into place then screw to the joists by three large screw each side.
Is it much more complicated than that? I would appreciate any advice.
Sounds like a great project for maximising storage space @DaveLee. I'm sure Workshop members will be happy to help.
Welcome to the community. We're looking forward to seeing you complete this project and many others to come in the future. Feel free to post anytime you need a hand with anything around the house or garden.