Glass top replacement

Oven/Range/Cooktop Repair
1

Can I replace the glass top of my jenn air range myself

2

Here are your parts
Replacement parts for JENN-AIR JES9900BAF | AppliancePartsPros.com

Here is a service manual, a tech sheet and a service bulletin which may or may not apply.
http://www.servicematters.com/maytag_library/docs/16026926.pdf
http://www.servicematters.com/maytag_library/docs/16027004.pdf
http://www.servicematters.com/maytag_library/docs/TDC-0101-B.pdf

With the above info you should be able to do it.
Just take your time and be sure to label/mark any wires you may have to remove. A digital camera can come in handy to help remember how things were hooked up.