Always chock the wheels, and get on axle stands asap...
Thom
This might be obvious but i cant see it... If you jack the car up using the sill (trolley jack), but your meant to put axle stands on asap, where do the axle stands go, i thought they went on the sills?
Good point
On the front, they need to go under the chassis legs... thats about where your feet would go if you were sitting in the front seat, if that makes sense, and again, I'd avoid using the cups on the floor...
Axle stands on the rear, can be placed under the rear sill edge, or placed under the body mounting points for the rear axle, but it largely depends on what you're going to doing under the car
Its also never a good idea to jack up just one area of the car and leave it in the air for a prolonged time, this will put adverse strain on the bodyshell, and can be evident by opening one of the doors, and finding it no longer fits properly! Though the shell should return to its proper shape when placed on the ground again
Extra care should also be taken when extensive welding repairs are carried out, as the shell must be supported correctly, to ensure alignment stays true... but thats another story

Thom