I think your confusing skills (like self control and lock picking) with abilities which can be selected via CAS's dialog under additional questions and then abilities.you cannot learn new abilities, you can train those listed. up to now the only ability you can train is self control in the yoga lessons.
At current it only seems like the tier 1 abilities, seeing basic data about the girls, can be unlocked. Also at this time it appears you can select a max of one of those with the fun points we can get in game, and there is no way to swap or "unequip" it once selected. I would suggest holding off on selecting any for now as you may want to save up the fun points for a higher tier skill down the line once implemented. Not sure what Hydra has planned for those.
Also great game, a bit grindy but the choice branching is immense enough that there is enough to keep it fresh. I can't imagine what a 15 day run will look like though if every day has as much as day one did content wise.