Here is a free securities performance calculator/trading diary you can download for free if you wish.
http://www.trading-lab.com/forums/trading_lab_securities_performance_calculator-t597.html
enjoy
since the previous link above is outdated...here is a new one with the turtle rules...
http://www.trading-lab.com/forums/turtle_trading_rules-t316.html
i suppose it depends. if your the type that approaches the markets as if they were a casino and takes big gambles (bets)..then yes..luck may be important to you.
if you look at the market in terms of risk control and probabilites...then not so much.
just my perspective.
are you wanting to still trade after such big losses? if so, what are you planning on doing as far as risk management is concerned? have you looked into RM yet since your beginning post?
Good Article
here is an article i found on how to build a trading system...i think its mechanical.
http://www.trading-lab.com/forums/building_trading_systems-t196.html