If you don’t take stress on demo, then surely real trading would be stressful. So, new traders should take the demo as serious as possible.For sure, real trading is stressful and could be unsuitable for some traders. It all depends on personal attitude to risks.
Then I must say; back-testing is a good option; by the way, personally I started my trading through demo then cent & finally the live account.Of course, but trader will always keep in mind that these money are not real. To my mind, cent account will be better for such purpose. Demo account suits for manual testing (after automated testing using special software like Forex Teste or something like that), and cent account trading will be the next step. It allows to get trading experience without the risk of substancial loss. At the same time,it operates with real money, that gives the feelings similar to real trading.