Carter, this thread has some pics that might be helpful:
http://forums.pelicanparts.com/showthread.php?t=258261&highlight=souk+lift
I have the same lift that Souk (the author of the above thread) has. Basically, you want to position your lift arms at areas where the underbody is strongly supported at reinforced intersections. I go for the front floorpan corners (being mindful of oil and A/C lines) and in the back the area similar to Souk's pics.
I use hockey pucks on top of the pads to get the lift points just right. Go slowly at first by checking where everything is at just before the car starts going up. Check it again after you start taking the weight of the car on. After confirming everything once again, take it on up.
Enjoy the lift. You're wrenching professionally now.
Brian