1972 Duster ABS Headliner question

Spoke to Year One this morning. We were right in the fact that the ABS Plastic (cloth cover) headliner does come pre-trimmed. All we can figure now is that we need a little more muscle power to get it fitted in there.
Will be posting results of project along with any tips for doing this as soon as it is finished! Will probably be Sunday.
Thanks for the replies and will keep you posted.

MOPARS ROCKS!!!!