It depends on your situation. If the girl you like is close to you like you can talk to her everyday and you always see each other everytime. If this is your case, you are close to your goal to make her fall inlove with you. You must make her smile everyday. In that way she can feel comportable to you. Give her a lot of attention. So you have a lot of moment. Treat her. If the case is that you are only seeing her and did'nt talk to her for the first time. You must make a move or chat her, that way you will start the first move and do as what i say.