I just did this modification last Sunday. I watched the JHM included DVD and it felt like it was too easy during the installation.
I mean people came by and were horrified that my intake was off the car and you could see the valves through the intake ports like I was rebuilding the engine or something.
The only part that took a long time was that I decided to clean off the very thin layer of sludge/carbon whatever it is off the intake ports and in the cylinder head. that killed my back because I cleaned all 8 cylinder ports and while it was a thin layer it still takes some effort and the car is so low. Also, I used the vacuum with a straw method to clean out the small dust and dirt particles that inevitably fall onto the valves.
The only thing I didn’t do that is kind of annoying is I couldn’t get 2 of the 4 sensors that you unclip from the manifold back on. They were the ones on the right side of the manifold when you’re looking at the front of your car. The wire was not long enough with the increased height of the manifold bc of several zip ties holding the wire down stream.
Also, I was a little upset the JHM kit did not come with washers for the new bolts. So I am thinking of picking up washers for all the bolts and messing with the zip ties to get the sensors back on.