Don't Be a Chicken, Go for It

If you want to get better at English, if you've set yourself smart goals, as Monce suggests, then you have to go for it. But don't try to set yourself 50 phrasal verbs in a week. That's not realistic that I think is too hard. Don't push yourself too much, because it could have the opposite effect. If it's not realistic, if you ask too much of yourself, you probably won't achieve it and you'll only feel worse. Yes, and as Craig said, also make it realistic. So four new phrAsal verbs is realistic. You could do that.