WTF Mintpal. I sold at 18 and wanted to buy back in at 17. I have been doing this all week and have made a considerable amount, however, when I saw it rising I went to cancel to buy back in, I don't mind loosing a little as I am still up overall. I tried to cancel and I can't. Now it's at fucking 30! So i'm pissed off right now. I've basically lost half my coins, and if it keep on going then forget it, ill just put my BTC into another coin. Fuck this.
Don't day trade with half of your coins...for exactly this reason. If you are new to day trading, you must know that you are not going to win 100% of the time, there is considerable risk. When a bad trade happens, you don't want to get wiped out. I think the general rule of thumb is using 2%-3% of your total. That way if things go bad you are only out 2-3%.