I agree with weedhound. You can go overboard with concerns that may or may not be all that big of a deal. I've been growing for less than two years and I remember how I'd freak when something was going wrong. Some grows were better than others and none went as smooth as I would have liked. In the end the bud came out looking great and every bit as good as what I would have bought on the street, regardless of what the plants themselves may have endured. It's kind of like being a parent. The first one is a stressful trip. After that things more or less fall into place and aren't as stressful as the first. It's good to stay on top of things but you can overdue the freak outs.

This board answered a lot of the basics (along with a few grow books) when I first started growing. Another thing I've learned is that there are more ways to do something than what some people swear can only be done one way. So as long as your plants don't die outright, you're still in the game.