[TravsCruze]

For the rear, you can jack under the spring perch. Just throw a jack there, its flat enough to get the job done and it won't hurt anything. There is also a tiny little sweet spot where the trailing arm connects to the axle. Its not very big, but its there. Its relatively flat and has a small notch in it that will grab a floor jack nicely. I wouldn't under any circumstances jack up on the axle. Its pretty thin material and is definitely not stout enough to take it.

for the spring perch you go in from behind, mostly parallel to the edge of the tire
for the other spot you go in from in front of tire at about a 45 degree angle.