The best way I've found is to get a 2' length of scaffold plank (which I also use as an extension to ramps to stop the front spoiler hitting) place it under the sill about 10" from the emergency jacking point and lift with a trolley jack. This lifts the entire side of the car up, I then stick the axle stands in place under the box sections behind the front and rear wheels.
This is also a quick way to get the car up to rotate the road wheels front to back.
Do the same on the other side, checking to make sure the car isn't creeping.
I always use wheel chocks as well and leave the trolley jack in place while the car is up. Another tip is to stick your road wheels under the car while it is up.
If at all possible I use ramps ie messing about with the exhaust (see below).
If you have a tarmac drive 6" square metal plates are good to stop the wheels of the trolley jack sinking in, you should be able to get them from an engineering company as off-cuts.
In my youth I did some crazy things to get the car in the air, worst of which was to jack the car up off the curb with the emergency jack to try and change the exhaust... the result being I pulled on the exhaust and the car came off the jack while I was under it. I was wearing a baseball cap and the car hit the peak when it fell. I got out from under the car, drove to my nearest motor factor and bought a set of stands, ramps and a trolley jack. When I got back I moved the car onto the drive too!!
