Usually you know the least at the start so your plans at that point are rubbish. So you keep refining your plans ..... Who gets to do things that they have exp

Usually you know the least at the start so your plans at that point are rubbish. So you keep refining your plans ..... Who gets to do things that they have experience in all the time? Not me at lest. And what manual do you read ? There's almost never anyone who understands it all quite apart from having written "a manual".