I purchased a headliner for my '51 and it comes rolled up in a box. So I'm thinking a steamer will help get it flattened out a bit and get the curvature correct to get it installed (still a ways off, as the cab isn't in paint yet.) Maybe put it in the bathroom when you're getting a nice hot shower.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.