Richard Howell has good videos about fp.
As mentioned check out Milburn, Howell, Lister and all the threads on these pages
(lots of good info there).
Don't get confused about diversity of ideas
- there are many ways to skin a cat - find out what works for you.
Fretboard/top join is possible to do without any ¨pre-polishing¨.
I do that every time when beginning a new bodying session.
1) One long pass all along the side of the fretboard beginning from the rosette with a folded cloth. The cloth must be made so that it goes to the ¨corner¨ where the fretboard and the top meets (it touches the top a little bit too).
2) Then I do 1 - 3 cm wide area of the top that borders to the fretboard with a small muneca as close as possible to the fretboard with out touching it with clock- and anti clockwise rotations, only one pass each.
My small muneca is about size of 5 cent coin and one side of it is very thin so that I can guide it with a finger by pressing it very lightly,
this thin side works closest to the fretboard.
3) When later on bodying the whole top (with a normal size muneca) I treat that part as anything else.