I spray the dash with glue. Wait till the glue tacks up. Then I start laying the vinyl in the middle, working the air bubbles out to the edges. You spray a little glue on a bad spot so you can move the vinyl. I wait 15 - 20 minutes to make sure there are no air bubbles. Then I trim all but 1" off and then I spray glue around the edge (about 1" wide) of the backside of the dash and extra vinyl. Wait till it dry's a little. Then roll the vinyl (about 1")over and clip it down with a lot of cloth pins. With tacked up glue on both you cannot slide it aroung. Where you place it, it sticks but you can pull it off and re-glue it. If the glue is wet you can move the vinyl around but you have to wait till it dry's to see that it is where you want it with no bubbles.
Dwight
this is the only picture I could find with cloth pins. I use a lot of them to hold the vinyl in place till it drys.