I think as humans we try and over complicate strategy to prove to ourselves just how clever we are. We rarely acknowledge the importance of common sense and trusting instinct. As far as trading is concerned the biggest problem I come across is over trading. It's not just about using too much gearing or moving your stops when they're about to be hit or snatching at a profit way too soon because 'no one goes broke booking a profit'. It's not even about trading product you don't understand as most peoples chances of winning are about the same as a coin toss regardless what you trade or what direction you choose. IMHO it is over trading that is the monkey on the back of most 'traders'. If you trade 10 times a day on a 2 point spread you need to book 400 points a month to stand still. Common sense will tell you (or it bloody well should) that that is a rather optimistic target over a long period of time. Its possible to make 400 points a month but that's not the point, you have to make 400 points EVERY month and you have to do it to stay flat.
I know its boring and not glam or what you may consider to be real trading (whatever that is) but there is a lot to be said for the basic common sense stuff of picking a good level for your entry, placing a limit a healthy distance away and a stop loss at a level that isn't going to wipe you out and then walking away from your platform until you get that email that tells you one of your closing orders has been filled.
Take the human need to be proven right out of the equation. Banish the part of your phycology that won't let you leave your stop where it is to be hit. Let it be hit, take the loss. So what, its not personal, you got it wrong and its ok to be wrong, at least you haven't paid 400 points of spread along the way.
It's so much harder to take a profit when the spread is always against you, this is not a 50/50 game as the broker has the spread in his favour. If you put your stop and limit 10 points from your entry on a 2 pip price, the price has to move 12 points your favour for your profit to be booked but only 8 points against you for your stop to be hit. Consider this, consider the obvious - the spread is your cost, reduce your number of deals and you reduce your costs significantly.