Jacking Up All Fours Techique

[Bhatti, Mohammed]

Hi Folks,
 
In the process of repairing a leak in the lower tranny cooler line and changing the tranny fluid on my 97 A4 18tqa.  Need to have the car level before I proceed.  Wanted to know how you guys normally jack up all four wheels.  I've got a pair of jack stands and will be buying another set.
 
So, do you jack up one corner, say RF, the LR then LF and then RR or do you just do the front then the back?
 
Also, can I jack up the car from the front/rear sub frame to place the jack stands under the jack points without damaging the sub frame?
 
Any special techique to this?
 
Thanks
 
Mohammed
97 A4 18tqa