There are these geniuses that can do something they never did before and create something truly amazing. But realistically even they don't manage to deliver on that the majority of the time.

Even the steam engine people had to rely on known standard parts like screws and bolts and known planing or manufacturing procedures that they didn't invent. Only because they knew which forces a bolt would withstand and learned from (at times catastrophic) failure they were able to even have a bleeding edge.