the idea that someone can 'transform into or become' a pro is sort of the wrong way to think about it. its more like that there is a pro inside of you and you have to bring it out. like a sculptor and a stone. and then that being needs to be brutally scrutinized.
i was a div3-pro @ 19 years old - i know this doesn't mean much but it does place me on the inside rather than the outside.
i won my 1st junior race on a bike with downtube shifters vs. dura-ace bikes. i would beat up on older riders who were cat 1 & 2 when i was still a junior-5. Plus ++ I have a natural inclination for cycling tactics - most other riders do not: they are fodder. in pro races @ 19 y.o. i was the fodder for the older riders. experienced pros are the most cunning, tricky, mentally perfect beings i've ever been around.
lately i've seen some older riders get good late-in-life but they were some guys who came from other sports and were dominant in those.
i think most new cycling folks with their power meters, etc., do not understand that really the mentality of the rider is what makes them a pro or not. some pros (and i was one of them) were always waiting for this perfect moment (that wouldn't come often for me) where we were win solo by overpowering everyone with the perfect timing. once you've done this, its like heroin. you've got to go back for more. you want to dominate-perfectly. where all of the other riders are made to give up/crack and they can't help but let you win. i believe that is the attitude. this sort of athletic transcendence in which all of the work and sacrifices that came in training and racing prior, culminate in a victory. just look at the guys on the tube who win their first TdF stage solo: what that is like for them - is the entire point of their entire career. i suppose for guys like LA its about the money too, but even he has that addiction to winning - why else would he goto such great lengths to win? there is more than one way to make money afterall.
if you do not always have this in the back of your mind: you will not become a pro no matter how many watts you've got, because i'll be on your wheel waiting to crack you psychologically and get my fix and take pleasure in seeing you with your head hung low.
cheers.