First I hung a hook from the garage ceiling so I could hang it from some wire to get it right at a good working level..
Definitely you want a bucket of water to get it wet and that way you can stretch it tight like said overlapping it.. also some rubber gloves, it's fiberglass... Also I used hose clamps where it was going to be held under laying wraps and the nice thin stainless steel ones mear the heads.. I needed three spools as it took a little more than one for each header doing it correctly.. and also I painted them with the silicone paint to give them a protective coating... That was two years ago and this winter I'm going to pull the motor for other reasons and we'll give them a nice spray down again..