For larger patterns on drivit try this. And i have to give credit where it's due to Ken Cowgill, a good friend of mine who gave me this tip.
Before leaving the shop (or onsite if there is room) layout the pattern and lay down a strip of duct tape around the perimeter of the pattern- plus maybe a few extra strips if the pattern is large enough. When you get onsite start the pattern but instead of using duct tape, use staples in a std. staple gun to staple the pattern to the wall, but only through the duct tape. It's faster than tape and holds better than just duct tape. Use SS staples (the longer the better) because you will of course miss some staples and don't want them to rust in short order. And it makes taking the pattern down easier since the
paper doesn't rip every few feet.
Another tip is to spray glue the pattern to that corrugated cardboard that comes in a roll. You probably already recycle it from packing. I know of one larger Philly shop that does this with all their patterns so their crews can hang patterns in the worst rain and wind. Then attach the pattern with the appropriate anchors - inside the letters of course.
Most of the time I just use the extra wide gorilla tape and tape the pattern in place. I've hung 60" x 30' patterns on concrete walls by myself - though it wasn't very windy that day. Another tip (if you aren't stapling to the wall) is to take a rubber mallet and bang the duct tape into the drivit so it holds better. it gets into the crevices better.