I've just been quite stupid. I reached the point where I got a room in the Homestead where I could respec.. so.. I did. And I wasn't really paying attention, so all my skills are gone.
I managed to get them all back except Ranged Power Stance, Barrage and Summon Wolf. Now I've been reading the forums and apparently they're quite rare. Anyone know where I could find these?
Follow up question: I've ready about crafting skill books, but it seems I can only craft elemental books. Can anyone confirm this? Is there no way to make Marksman books (and by extension, Man-At-Arms and Scoundrel)?
