Always one of my fears, I always use jack stands, and then put the jack up to it so its touching, just for extra safety encase a jack stand fails.

97 Talon ESi 14.943@91.35MPH N/A!
"If you need someone to provide an itemized build of materials and a flowchart to walk you through every build-related question you will need to answer at each step of the process, you shouldn't be playing with cars. "-Driggs