How to fit an electric garage door opener

Hi All,
I have just bought a Wessex Lift Boy garage door opener from eBay and after a few hours of googling I can't find out how to fit one of these. I have
a retractable fibre glass garage door. I have a few questions if anyone ha s experience with fitting one of these or similar... 1. The arm seems to screw into the door. There is a thicker section at the top of the middle of the door. Is this reinforced to screw the bracket in to or do I need to do something special to distribute the force? 2. Anyone know where I would get a wiring diagram to see how to fit the rem ote and connect to the mains? 3. How do I fit this to the ceiling? Any tips
Thanks in advance for any help
Lee.
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