with the experience and practice you become the successful trader in the Forex trading. If some one bear loss in the starting then never be disappointed and continue his trading with hard work and learn form his mistakes. it is true that loss is very painful for any one that invest the money for profit but is the the first step of your success. I would like to correct you here that neither stop loss or hedging can prevent margin call for you. Hedging will only postpone the margin call for a bad trader but a good trader will be able to correct a bad situation through hedging. What can prevent a margin call for you is when you can use a good strategy and then mix it with proper money management like using 10% of your account at maximum exposure.