73 Duster Conversion Headliner

hi,
I Have a 73 duster that had a hard headliner, i currently have bought a conversion headliner to convert it to a bow style headliner,
In the kit it came with headliner /rods/brackets,
Just wondering if anyone has installed one of these before.? How did you go installing it .? Where did you know where to screw in the brackets.?
Any help will be great.
Thanks
An option would be to...
can/has it been done?? home made headliner...