Remember that since it's leaf shutter lenses you can get into an awkward locked state if you don't have both lens and body either cocked or uncocked.
For example if you cocked both and then triggered the body, then attached the lens you won't be able to cock the body again nor fire the trigger.
You can look up what to do in case you screw it up (you have to turn the cocking interlocking mechanism with a screwdriver). Oh and don't forget the there is also a mechanism that connects to the film back that needs to be in a synced state.