The key part of your pre-throw routine, is that, whatever it is, it allows you to focus only on the throw at hand and nothing else. Through repetition, you train your mind that the routine is the time for you to focus on the target line and get ready to pull through that line- nothing else. Any other considerations such as wind, conditions, other lines, etc. should already have been thought through prior to this. The last part of your routine should be your "trigger"- the action that lets your body know it's time to start the run-up, x-step, etc.