Before the final shaping of the neck, the fingerboard needs to be shaped and installed. The ebony blanks come basically fingerboard-shaped, but far too bulky. With a series of planes, gouges, and scrapers, I reduce some of the mass from underneath as well as from above.
Once the fingerboard is in reasonable shape, I layout its position on the neck and then glue a few locater studs, in this case 2 on each side. This makes it easier to put the fingerboard on in the right place when the slippery hide glue is on.
I glue it on firmly, not a simple tack, because it's going to stay on. I use the fingerboard to help align the neck while fitting, and leave it on while varnishing, as was done in the old days.