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Unfortunately, I do not have a lift yet so I have been doing it on jackstands. And I had to do it a few times because I modified a catless x-pipe into one with 4 resonators and had to do some test fitting and have also had to switch back for servicing. I can do it in an hour now, but double that for the first time.
At the header to midpipe connection, there are fiber cone shaped crush rings. Most x-pipes preserve these, but some don't mate well with them. If yours disintegrate or you find you have exhaust leaks, you may have to replace them. A temporary or even permanent fix might be high temp copper sealant by Permatex. My cones have held up so far, but I may replace them.
I also use antiseize on the 02 threads and a thin layer around the front and rear pipe ends of the midpipe.
Make sure you get the rear clamps positioned and tightened correctly. If they come loose, the bolt may vibrate out and you may lose the clamp fittings, which are not sold separately. I learned this the hard way.
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