If you ve used a jack stand, before lowering the jack you will need to raise the car slightly to pull the stand from its place. Avoid trying to jack up a car on appreciably tilted ground. Make sure everyone is out of the car before jacking it up. There are several different kinds of jacks. If you're not sure how to operate yours and don't see directions in your owner's manual, call for help.
Cars can slip off jacks.
It's unsafe to get under a car that's supported only by a jack. Use jack stands if the car will be off the ground for any period of time, if you plan to get underneath it, or if you'll be working or making repairs on the car. Don't jack up a car unless you're on a cement surface. Watch out for soft shoulders and very hot pavement, which may not support the jack. Inc. How things get done.