I just finished the bastard pack on my jeep within the last month. I replaced two YJ springs with two S10 springs in the rear, and took out 1 YJ spring and added 1 S10 spring and 1 3/4ton Silverado spring in the front. This netted me 3.5in in the front and 2.5-3 in the rear. It rides like a bus, but I haven't taken my Traction bars off yet. But it's a fairly standard streamlined process. The only difference between buying a lift kit and doing this, is you choose how high you want to go.
One thing you need to look into that others haven't detailed that I ran into is the Teflon padding or the noise suppressants on the ends of the springs to eliminate squeaks. I drilled each end for the Teflon pads on the rear, which is horrible, spent $80.00 on drill bits. Instead, use a material called Graphite Lubricant, or Slip Plate. It's like $10.00 for a spray can, Applies like paint, but sticks to it for a loooong time. My rear springs squeak more than my fronts, and I applied the Graphite to the front. I got it from an industrial retailer.
It depends on your Jeep if you need a TC drop or any other driveline correction. Some people got 3in of lift and didn't need to. After I lifted the Rear and drove it around for a week, I needed a TC drop. For about $50.00 w/ shipping I got one from skyjacker, and it fixed all of the vibrations.
But here's the before and after shots
If you need any help at all, links to the Slip plate, etc, PM me or go to the link above to the FAQ and ask the OP of that thread, he helped me alot through my experience.