Re: shackel flip
The link Norm posted is all you need. Line up the shackle pivot with the forward set of old mounting holes and you can't screw up. There's a pic on that link, it's worth a thousand words.
And yes, the stock springs will fatigue over time. I've been thru 2 main leafs on the right rear. I still recommend the flip, tho, it's the most bang for the buck. I've nearly got the fatigue issue licked by swapping in an additional spring that's nearly as long as the main leaf, thus providing more support for that leaf.