To line up a shot properly, first you need to understand what the line of the shot is.
The line of the shot starts from the point of contact on the object ball that the cue ball will connect with. From that point the line then goes to the cue ball.
How you look round the table can have a big influence on your opponents game as well as your own.
If you act confident you feel confident. So even when you are not feeling great, you can still look confident.