Hold my hand

I keep wondering what is holding me back. I am told that when you like a guy, you go talk to him. Just like that. I say: easier said than done. I am thinking about this and I came to the conclusion that what you say is the important part. But, what do you say? how you break the ice? how you follow? what do you do and say or not say if you get rejected. How important is and how to deal with rejection. Or what you do and say if he expresses interest in you too. Oh, I need not go there. I should first learn to deal with rejection before anything else. I could pick up a guy I know it is not accessible to me. I need to practice.