RE: new trainer
WARNING........
Heat gun is excellent advice, HOWEVER.....
You really need an iron too. No matter how expert you can get with a heat gun, the covering on ARFs has been installed by people who only have to get it placed properly. The seams and overlaps are not reliably stuck. Most are, but it's not safe to assume that all are. If you don't go over all the seams and overlaps with an iron first, you WILL discover that the heat from a gun will pull covering apart at some seams.
Get an iron and use it first. All you gotta do with it is insure that the seams are down, but you'd best do that with every ARF. Every one.