Can anyone give me any tips on installing a sure grip on my Widow PSA?

Pull and tug and do it some more.  Really helps to roll it into ball and keep working it down.

Roll it like Maxwell said, then put a piece of rope through it. Tie off a loop just big enough to get your foot into. Work it up the bottom limb to the riser. Then use your foot to work it up on one side, and then the other. It will stretch more than you think. I have put them on two Widows, and others.

Just as they say roll it up  and use a couple of strong strings or rope to pull it on.I find the posi-grip stretches easier then a shur-grip to slip on larger risers.

I have put on 2 PA's and a KB , did not use a rope( not smart enough to think of that!) get it in a roll and use your thumbs. Be patient it will get there.

Thank you guys.