Your were exactly right about the "12 year old clips", I managed to break only one.
The bad thing is, it is one of the two clips
that are on the armrest. I can't tell if
these are replaceable or if they are molded
into the armrest. It appears that the armrest is sealed to the door lining itself.
Do you have any info for a rookie diy?
Thanks for the information on the sheeting.