I put mine in around November or so I think, install wasn't that bad. I ended up getting two passenger side headers, which was dealt with quickly and easily (and the weather held up until I finished which was a miracle :canada
Dropping the drive shaft was really all I needed, getting at the bolts (especially to tighten them down at the end) was a bastard, but just took some time. Dunno how you'd ever expect to get a torque wrench on there. Removing the rear studs is definitely key, and jacking the motor a bit, even with the motor mounts tightened down.
I also wrapped the headers in an old t-shirt and taped them up, makes for a lot less cringes when your banging em around the steering shaft. Then just cut the shirt off at the end.