Do not use a penny for marging trading, you HAVE TO lose your assets longterm. The ONLY reason to use it is as an assurance against market fluctuation, if you cannot trade your asset itself (buy low, sell high).
If a trader has never used and experienced marginal tradings, he or she will never get actual feelings about the market. His/ her emotions will change fastly with market movements or even fluctuations.
As I recommended above, using a very small part of your capital for tradings and a minor part of that part for margin trading is good. You won't lose too much of your whole capital. I agree that if one does not manage him-/her-self on which proportion of capital will be used for margin tradings, he/she should never do margin tradings because of there are extremely high risks of liquidations with the type of trading. The risks are much higher for newbies.
Even with experienced traders, there are unavoidable risks of liquidation as a consequence of cascade effects on exchanges.
