I think you just about have to remove the glass. From the fronts anyway. Thats the only way you can get the the lower 'mount'. I bent mine thru the curve but after messing up the second one I bought a "pre-bent" one from T-Bird Products.
The clips are Chinese junk and after having a couple come off and breaking the ears that clip it on the channel while 'adjusting the fit', I used 3M Weather Stripping Adhesive (Black) to glue it is place. Worked good but I'm not sure that's the "Right Way" to do it.
I have a RanchWagon so I have no advice for the rears.