advice wanted

[Jo-boater]

From reading through some of the investment posts on here, it seems that many of you guys have a decent handle on how to make a little money in the market. I have never been able to make money consistently with it, but I still try to make it work. The times where it seems like I have made a good buy that goes up and could make me money, I wait to long and it comes back down and does not seem to make it back up. My question is, when do you decide to sell? Do you set a percentage profit as your goal, and when and if it reaches this goal, do you sell all or just some of your shares? If you have a certain amount you expect it to get to and it does not seem to be headed that high, what determines if you want to keep it? I know there are thousands of different scenarios to answer this with, but I just wanted to see what tips you may have so I might can get a little better at this. The only stock I currently have is ABAT.