and i may be stating the obvious...but when the liner comes out of the oven, put the liner on your foot first, then put it into the shell. the liner swells when its hot and youll never be able to get it in by hand.  oh, and also, you cant just set your liner on the hot over rack, or youll melt griddle marks into your liners.(yep, been there done that) Put them in on a cool rack or pan