At what point do i install a garage door opener?

I have the exterior walls insulated, wired and vapour sealed. The insulation stops are in place in the rafters. I am ready to insulate and vapour the ceiling. Should i install a garage door opener before or after the ceiling is finished? Does it matter which is done first? Please help........ Oh, i also have... show more I have the exterior walls insulated, wired and vapour sealed. The insulation stops are in place in the rafters. I am ready to insulate and vapour the ceiling. Should i install a garage door opener before or after the ceiling is finished? Does it matter which is done first? Please help........
Oh, i also have wired the garage totally for all lights and plug ins, there are already power sources at both door opener areas.
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