Very good stuff.
Ken Smith's Chess Improvement Course
This is one of the gems contained therein:
"If you aren't at least a "high Class A Player…..this news is for you…..! Until you are at least a high Class A player:
Your first name is "Tactics", your middle name is "Tactics", and your last name is "Tactics". You can overcome a weak opening and be so far ahead in material that the endgame is mopping up.
I demand that you get every book on tactics and combinations that you can afford and study it as if your life depended on it!"