Question, after you chop a top of a late model car let's say a pinto wagon how do you cut the glass to size.

I would like to custom my pinto wagon by droping it two inches both front and rear, and chop the top of it four inhes to give it that low down look. the problem is how do i cut the glass or reshape it . It’s a 1979 so it has safety glass. And i here it will shatter if i try to cut it.