Alan, For me, it is/was well worth the upgrade. The cut is SUPER smooth, much quieter and the wood goes through much easier. I think with my instructions it is very doable and highly likely you could complete the process in under 4 hours. Also, I think almost any woodworker can do the upgrade. BTW it takes 3-4 weeks to receive the head after you order. Byrd does not have them sitting on the shelf waiting to be shipped.
Because I spent soooooo much time in the documentation phase it is very difficult to determine how much time I spent on the upgrade itself. Also because I did not have an accurate road map I went down a few paths that just sucked up a LOT of time.
I agree that labeling/bagging all the parts did take extra time but during the reassembly, I discovered it was SOOOOOO much easier to find ALL the darn parts I needed for a step. At the end of the reassembly, there were NO Missing or Extra parts! YEA!!!
The reinstall was much faster mainly because I could reference the install. For the most part, it was the reverse of the uninstall of the old head but I did make a few minor changes to the flow.
The total cost of the head was about $960, I ordered the bearings (they were pressed on by Byrd), some extra cutters, and extra screws.
Because I now have a larger shop, "IF" I did not have the A3-31, I would get a 20" planer and a separate joiner (I think, at least that is my current thought). However, I'm very happy with what I have.