Forex is one of the highly volatile market in which you can lose your amount very easily so it is always better to invest very small amount so that you will lose that one only and avoid the major loss from your trading. 2% in a day is quite reasonable profit we can expect on a winning day and for that we need not use most of available margin but a small portion of it will be sufficient and then our account can bear major volatility. We expect 2% risk vs 3% profit. if one trade take risk 10%. It will be to much. It means become a rich very quick. Actually not possible for one. We need ability to control. All new trader make 10% or more risk. if we have less risk then we can stay in market for long time. if we have high risk level and some trade close in loss then we are out of market.