you forgot to mention, if handles are prominent then you need to measure at least 90mm away from the actual window otherwise your blind won't be able to open and close properly
Too much detail missing - proper measurement and positioning of brackets, orientation of the rail (which is front and back), adjustment of cord length / height. 😔
I've been trying to get the 4th blind into the track for the last 2 months. Nothing works, it won't catch, so I've given up and have 3 windows with the blinds and a 4th without, which looks extremely stupid. Whoever invented these "simple" blinds should be fired. Extremely difficult to work with.