Ive been trading for 3 years sinse 2006, and here is what ive learned so far to summarize: (some of the details are fictional)
year 1. Joe Trader thinks to himself "How hard can this really be?...all you do is buy when price is low and sell it when price goes back up. I will use MA crossovers and make millions!". In the first year the trader is filled with confidence, and excitement.
Year 2 Joe Trader looks at his PnL for the first year, and it's not what he expected. He's down 20% in his account. What he thought was so easy, completely ignored critical details like money management and stops. Realizing that his career is much more involved than he initially thought. He heads to the book store, and the internet to learn more about this complex world. Little does this innocent trader know that he's about to introduce a new posion to his system. The guru. For just 3,497.00 Joe trader can learn the "secret to the market"...what other traders "Dont know"...taught by "professional traders". Sounds good he thinks, and signs up.
Three months later Joe trader isnt much happier or profitable. The "system" that he learned was nothing more than a MA crossover system with a fancy name, and the "guru" that created the system was arrested for credit card fraud because he couldn't make money in the markets. The search for the Holy grail begins.
Eight months later Joe trader is down another 7%. He's had a few winners but his emotions and lack of a solid trading plan result in amature trading decisions. Joe trader learns of other indicators like MACD, RSI, and stochastics. "Cool" he thinks to himself, as the market tends to follow the ups and downs of these magic indicators. Joe Trader is like a kid in a candy store and adds all three indicators plus the two Ma's he first had.
In the last month of year two, Joe trader is down another 9%..to a total of -36% in two years. What he thought would make trading easier, has only added to his confusion, as price and the indicators gave false or choppy signals. Joe trader is starting to lose confidence in his ability to be a trader, and all his friends and family just say "I TOLD YOU SO". Joe trader is damn determined to make it, and sits down with a pen and paper, and begins to write down a rough copy of a trading plan addressing important issues such as entry, stops, adding to and scaling out, etc...
Year 3 Joe trader has made hundreds of mistakes, but is now starting to make money. While not every week, he's always studying, and refining his sysyem. He has a solid MM plan, and has givin up trading intraday. Joe knows that if he's not consistant in his approach, he wont have consistant results. Joe trades ends the year up 40%. His friends take notice and they want Joe to teach them how to trade because they're miserable in their jobs. Joe says he'll think about it

.
Year 6 Joe Trader is a happily successful trader managing over 450,000, making an average of 7.5% a month. Life is good.