my friend says I should play agaisnt loose players but I've noticed its been easier to get money from the tight ones. Especially if you're not patient.

however, the same friend gave me some awesome advice about this. He said he sets an amount of money that he is willing to lose, say $10. If he loses ten dollars he leaves. So if he is up $1000 and he lost $10, he is going to leave. As well as if he is at a table where the minimum buy-in is $100 and he loses $10, he will leave.

Now obviously, these examples are exaggerated, but you get the point. And I think its a good one.