My rating has been in absolute free fall the last couple of weeks, so I may not be the one to give advice.
but that has never stopped my before...
Stress tactics. Lower level games hang on tactics most of the time. Trying to study subtle positional issues while your opponent is beating your brains out with direct attacks and tactical combinations will just make you crazy, and you will wonder why you are not "getting better". Tactics tactics tactics.
Chernev's book is fantastic, I am reading it now. Its an excellent choice.
Throw in a little endgame study. Many lower level players badly neglect the endgame, and a little skill in this area will give you a huge advantage.
DONT spend to much time on openings. Its ok to spend a little time, but deep opening study is for more advanced players. Learn a few lines so you have some idea of where to start, but for the most part play the opening by good general principles (develop your pieces to active positions, get your king to safety, control the center, etc) and watch the tactics for traps and other problems. Don't start trying to memorize a bunch of opening lines. It is better to know five lines with a genuine understanding of why you are playing the moves you are playing then to know fifty lines from route memory alone.
And if we play a game, let me win. I have had the worst case of tactical blindness lately, my rating is diving like a paralyzed falcon.
Thanks for the helpful responses. A few things:
1. I have do not have a good internet connection as of now. I only get internet (with really limited bandwidth) on certain times during the day, so right now I do not have the luxury of going on chess.com regularly. I plan to upgrade it soon, but I guess I can play against a human opponent online on certain days.
2. I do have Fritz, which I have recently purchased. I am not yet used to it, but I love it. The GUI and commands are a little bit overwhelming to me at first; once I'm used to it I think I'm gonna dump chessmaster and switch to Fritz. Not to mention it gives better analysis as well.
EDIT: after thinking about it for a while, I don't think I'm going to "dump" CM. The personalities I believe are much more fun to play than Fritz's, and the CM Academy is invaluable.
3. Thank you to the people who have recommended practising tactics. The website I posted also encourages it and I have a couple of books about it. Still, thanks for the website recommendation as it will serve as an invaluable resource for my endeavor.
The reason why I decided to study instead of just playing, playing, playing is because I need to develop good habits, and books tell me which habits to keep and which ones need to be disposed. If I just keep playing games without any instruction, I will just keep repeating the same mistakes over and over again, and I will not realise it. As they say, "practice makes habit" (I prefer habit over perfect), and if I practice the wrong things, I will be adept in doing the wrong things.