As far as the margin issue is concerned, I understand the relationship with the margin call which means how much margin trading is left. That means basically that if the market goes up to a certain amount of pips, I will delete it. For some brokers, say 10% or more. Now, when it comes to margins, I usually use a certain simple method. Let's say I'm trading 100usd, I know from my leverage I can trade 1lot. This means if the market goes 100pips negative, I will be taken out. Then what I would do to stay safe especially with using a big time frame is a 0.1 lot trading that gets me with a 1000pips retracement or a drop down level.