The thing that took me the longest time today was doing the preliminary neck-setting. Look over HERE for an explanation of how I sand the heel to get my neck both centered with the top and set at the proper back-angle.
After I have done all the sanding and checking (over and over), here is the result — my neck is centered, lining up (1) at the nut end,
and (3) at the tail end of the soundbox.
To the right: After all the neck-fitting is done, you can see that the cheeks of the heel are nice and tight to the soundbox. A good fit!