Installing carpet for the first time....?

after i get it where i want it, i take a hot soldering iron and from underneath, i burn through the seat bolt holes, and the seat belt holes ,they are a lot easier to locate from the top and the bolts dont get caught up in the carpet, and it keeps the carpet from fraying . i also use truck bed liner in a spray can and coat the floor....i always start from the trans hump / firewall area and work my way back and out to the rockers