Let it lay out for a good day or two to get its shape back. Use a carpet steamer to get any creases out. Go slow and remember you can always cut more so don't take off huge chunks as you fit it in. I used razor blades to do the cutting and to make holes when I did the acc carpet in my 98 and it came out pretty good.
I will say though, if you are expecting this to fit just like OEM... Its not going to. It'll be close and it'll look good but you'll have a few spots that are slightly off.
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2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.