On the necks I've built I installed them slightly long with overhang and trimmed them back to the fretboard before filing the ends round. This time I did a lot of the rounding/shaping before they went in.
This is the deluxster neck:
Initial seating
https://i.imgur.com/wPK6usy.jpg
Trimmed (sorry not the best pic)
https://i.imgur.com/G5z6uv4.jpg
Finished
https://i.imgur.com/FyeShg0.jpg
I'm thinking about doing a bound fretboard on the next one so this is good practice.