Hmm 1st u hv to know hw strong ur affection for the person is. 2nd u hv to know if ur introverted or extroverted cuz it will play a good role especially if the person knows u. 3rd boost or motivate yourself, it help to keep u calm. Then prepare what you’re gonna say that way you don’t fumble cuz of his dreamy beauty. 4th try to be casual and not extra formal or it might make the atmosphere heavy. 5th just do it.
FYI I ain’t speaking off experience but from what I know. Plus normally when I wanna talk to someone so bad but don’t know how i normally find the person when he or she is in a situation so I can help out then mayb introduce ourselves for a basic conversation to start. (That doesn’t mean go n put the person in a situation cuz if the person fades out hmmm the person won’t like to be around u cuz of the bad feeling.).
Hope this helps if you need more advice Im hear and other ppl as well.