i've had the same kit on my truck for about 4 years and have had no problems. as said previously...it's a big job and will take a day or two. i did mine by myself with limited tools and it took me about 15 hours including breaks, etc.
remember to use lock-tite on the bolts when tightening everything back up. and still its a good idea to go back and retorque the bolts after about 100 miles. just to make sure everything is good and tight.
also, get some good work gloves and find a buddy to help.
Thanks yall, i'll have to make sure I do it on my day off. And I also have access to a small shop with a chain hoist that I could lift the body up with but I'm not sure if that would help speed things up or slow me down.