Does anyone know the secret for installing the pinchweld clips and the trim that goes around the outside of the convertible top on a 69 Camaro?

I am having a heck of a time with this... Do you install the clips to the trim first or to the pinchweld?

I find that the clips don't fit the trim tightly so it is very difficult installing this trim when putting them on the trim first.

When I attach the clips to the pinchweld first, I can't snap the trim over them all the way...

Any tips or drawings would be helpful.

Thanks in advance!

-Japper