Send a friend to convey: Okay, firstly, NO. The only rule in a relationship is to buckle up and take every effort by yourself. if you’re having plans of asking your *maybe a hot* friend to confess on behalf of you, chances are that she might think you are a coward or just ask your friend out instead.
Writing a letter: Are you planning to start a new civilisation or a religion? Well, in that case, letters work as they can later be used as scripts. On a serious note, letters are great but not for proposing. You can write letters once your ladylove becomes your girlfriend and when you are out of ideas to convince your angry princess. However, if that IS THE idea for proposing, then there is not much we can do other than console you for your rejection.
Impressing her siblings: What literally runs in your mind when you think of stuff like that? What if she is not close to her sibling? Alright, maybe she is close to her sibling especially her brother and he is overprotective of her, all we can pray for is your good health. Hence, please think twice before you befriend your girl’s sibling or get well soon.
Comparing to celebrities: “You look like Samantha, can I be your Naga Chaitanya?” or “You look like Sameera Reddy, can I be your Suriya?” are the worst pick up lines to impress a girl. Kindly, stick your mouth with a tape if you are sure to blabber these words to her. She can be herself and still love you, you know? So, please. Just. Avoid.
Having a fake girl fan-following: You might think this is cool. However, she will conclude that you are definitely a pervert, a cheat or a disloyal person. You really aren’t in a masala movie. So please don’t.