@ OP:
I recommend that you refrain from reading productivity books - at least until you identify your main problem(s). For example:
- are you easily distracted?
- do you lack motivation?
- are you drowning in projects?
- do you have too many responsibilities?
First, figure out your problem. Second, brainstorm ways to deal with that specific issue. Implement one idea at a time and track your progress (no different from marketing).
Productivity books tend to take one of two approaches. They either throw a ton of general advice at the reader or advise the reader to adopt a specific tactic (e.g. pomodoro).
The former approach is unhelpful because the reader ends up drowning under a wave of general advice that doesn't address his main problem. The latter approach is usually unhelpful because the specific tactic that is recommended may not complement the reader's process. Everyone's different. Something that works for me may not work for you.
Productivity books are fun to read because they give you the feeling that you're improving your life in some way. But that's a mirage, and a seductive one at that.
So again, first, figure out your problem. Second, brainstorm ways to deal with it.
Bonus tip: print out Parkinson's Law ("Work expands so as to fill the time available for its completion") and post it where you'll see it while you work.