You've activated when you understand the book in detail like you do with traditional reading. How many activation passes have you made? I know that beginners give up way too soon. If the book normally takes you 12 hours to read you need to spend at least 4 hours in activation as a beginner. Nothing seems to happen at first, which is not surprising since you don't know the whole book in reading the first chapter either.
Do more activation passes. For each pass have one mind probing question you want answered when you start. When you find the answer ask another question.
No questions? No Answers then. If you're not forming questions have a purpose for reading.
Alex