it is a way to reduce some risk and of course we have to know the characteristics first before we try it and maybe with a demo account is a good decision ... I am a scalper but I use all time frames because a high time frame is needed to show trends and I only used 3 pairs in my trading and before I tried many pairs, but as a result I was not concentrating but now only three pairs are doing the accuracy and the results are good and the pair is EUR / USD, GBP / USD AND AUD / USD. after all, many of my firends recommended me to trade gold and silver but I still didn't trade either of the two partners.