The frame rails are fairly large and square. You can place the front jackstands about 3 inches back from the rear edge of the front fenderwell on the frame rail (about where the triangular brace attaches to the frame.
The rear jackstands can go under the attaching point for the lower trailing arm. (the sway bar gets in the way of the rear axle. Or you can go forward about 2 feet, and place the jackstands on the frame just back of the round cross brace.
The pumpkin is where the driveshaft attaches to the rear axle - not a great spot to grab, because the sway bar is in the way here also.
Like I said, get two more jackstands, and jack up each corner individually, or if your jack is strong enough, lift the whole side at once. Again, forget about working around any vehicle sitting on a hydraulic jack - nothing good is going to happen.
Your jack doesn't have to come down hard - just turn the valve enough so the jack comes down slow and smooth - this ain't NASCAR - no need to rush.
You might want to get a mechanically inclined friend to help you the first time. Also, if you're taking the wheels off, loosen the nuts slightly before you get the wheels in the air.