If deferring the install until the weather warms up is an option, then lay the unfolded carpet outside in the sun for a couple of hours before putting it in the vehicle. FWIW, I waited to install a new ACC carpet -- delivered in Feb 14 -- in the Cyclone until the first really hot day late last spring (we live in southern VA, so by mid-May there are days like that). It greatly eases the install; makes the carpet a cinch to spread out and the folds and creases disappear in no time.
Tip: DO NOT cut the carpet to fit sill plates, punch seat belt bolt holes, etc., until such time as it has fully settled into and conforms with the shape of the floor pan, with particular attention to the trans tunnel, corners, miscellaneous nooks and crannies, and so on (don't ask how I learned this lesson
) . This can be speeded up by placing weight on top of the freshly-installed carpet and leaving it for a couple of days; I used a bunch of 5- and 10-lb dumbells I had lying around but anything heavy and flat will work.
That said, it's difficult to be patient when it comes to recently-delivered new parts, and especially things like carpet that deliver a more-or-less instantaneous visual improvement.
