Open curtains from the back?

nick2008:
back post in do up 3 buckles

Front post in and take up the slack don’t over tighten making it like a drum
Do up remaining buckles

Now because you haven’t over stretched the curtain ,
by undoing the 3 buckles at the rear you could still open the curtain from the back,
you’ll have tension but enough that you can open the curtain .

Beat me to it.