An extremely positional opening is usually not something a beginner is going to understand. As you get more advanced you will develop a playing style and will certainly make adjustments to and expand on your opening system. When studying the opening don't just memorize moves. A good player not only knows his lines well, but has an understanding of the ideas behind the them. A well prepared player in the opening is hard to beat.
Pattern recognition is the key to learning tactics.
Study the tactical patterns in the problems given in the suggested books above. Try and work out each problem by spending no more than a few minutes on it. Then if you still haven't figured it out look up the solution in the book. Mark the ones you missed. Then move on to the next problem in the book.