Trying to plan my ability trees and stats, including points received from books and any other source I don't know, how many points can be obtained without modding the game?
150/154* attribute points and 51/53 talent points:
- 147 attribute points and 49 talent points from leveling to the cap of 50
- 3 attribute points and 2 talent points from Tomes of Mortal Vessel and Tomes of Technique, respectively
The Black Emporium DLC includes the following:
- 4 attribute points and 1 talent point from the same types of tomes mentioned above
- 1 talent point from either the Elixir of Arcane Technique or the Elixir of Physical Technique. Like the tomes in Dragon Age: Origins, these items are class restricted so you can't use both.
I asterisked the number because you can gain additional attribute points and talent points from the following:
Completing the quest Dark Epiphany to receive Avernus's Experimental Draught nets you 2 attribute points. This quest is only available if you've played Dragon Age: Origins, completed the Warden's Keep DLC, and spared Avernus at the end.
Completing the quest Night Terrors can lead to receiving 4 attribute points for solving puzzles and, depending on your dialogue choices, an additional 6 attribute points or 1 talent point.
Reading any of the evil tomes in the quest Forbidden Knowledge nets you 2 attribute points. Once you use this option, it won't appear in any of the other books.
Nothing of note.
The "hard" level cap might be 50, but a normal play through won't go anywhere near that. Expect to finish at level ~22/23. To be safe, let us assume level 22. That means 21*3 for 63 attribute points from leveling, and 21 ability points from leveling. Anything beyond that is gravy.
Mark Trapp correctly lists the availability of bought items to increase stats. So, add points as appropriate to your game.
However, he neglects a quests which can also reward the player with more attribute and (less commonly) ability points. I think you get earn 6-8 more attributes, but I only one additional ability point.