I have a pair of the suction cups but never use them on rubber set glass.
I trust my hands as the best tools as they won't let go of the glass till I'm ready.
You can do it yourself if you take your time and are careful.
The most important thing to remember about installing windshields is
glass won't bend without breaking.
You will need a 1/8" nylon cord saturated in 100% silicon spray lubricant.
Keep the rubber gasket wet also.
If you have or plan any painting going on in your shop use dish soap rather than the
silicon spray as it will cause problems later for your paint. The soap will require more wettings as you progress because it can dry up and get sticky when it needs to be slick to make it go easy.
A nylon board may be used very carfully if needed. Use only the open flat palm of your hand
to pat glass into place.
If you are planning a after seal between the rubber gasket and body use liquid butyl.
It comes in a metal can with a screw on cap. There is a trigger pump that screws onto the can
when you remove the lid. Make sure you heat the can of sealant so it will be liquid enough to flow out the small needle tip. I use a heat gun or propane torch.
C.R.Lawrence sells the sealant and pump for the can.
If you have any questions before you start, just send me a pm.