You don't want to do this yourself. You need special adheasive to hold an air Bag windshield in. Plus it takes allot of pratice to avoid both air and water leaks.
If you have the Pink tint sungate windshield, they cost more than other, if they can be found.
Pinkinton makes high end glass and supplies glass for GM. There is a high mark up in glass and if you shop around I would think about $250 installed. Call around.
Don't be shy. Tell the installer that you are a car nut and you want to make sure you have an experienced installer. Little things like scratching the paint when removing the glass where it sits in the body will show up in a few years as a rusty roof or pillar.