To add to the above, I did the 14 exams over 5 months in 3 sittings working full time with 3 kids at the age of 43 (my age, not the kids!). Most important thing is a supportive spouse. She needs to be ready to give up her social life for the next six plus months and to be prepared to receive much reduced help with the kids and domestic work from yourself.
Regarding the 'hardness' of the subject matter, it is not as hard as an engineering degree. My suggested method of learning is hit the question banks first, use text books / YouTube for reference and clarification, and be prepared to answer 200 to 400 questions from the bank every single day without exception. Its nothing but a pure slog, but with very interesting material which will make the learning easier as you obviously have a passion for aviation.
Best of luck!