I have been trading some new markets myself and really has been a really difficult and rewarding journey. I think more psychological than anything although there were some technical stumbling blocks. But there are nuances for each that needed to be considered. Just as every pair reacts differently it takes time to learn them. The struggle happened not right away but maybe 5 trading days after. i realized the tools i was using was not adapting to the environment, they were not optimal but still had effectiveness in them. So i began to hone and test my tools to try to fit them more with the new instrument. But was and still is a very difficult thing for me. But the rewards are substantial. Your foundation of trading remains the same its like softball to baseball. The rules are generally the same, the same types of plays work, but there are subtle differences in how you need to approach the game to get good performance. Some things may not work as well or will work very well in one of the environments but not the other.
For me the hardest thing was keeping it separate, not letting those frustrations bleed over into the market in which i am successful in. But now i have doubled my possible trading opportunities. So if you traded 1 pair successfully and had x number of set ups per time frame (day week month), now you have a chance to have 2x that during that same time frame. Instrument selection and correlation ratios are up to the trader but the process is the same.
For me I wonder, How much time and effort and money would other traders put into adding another instrument/pair to their arsenal? How much did you time effort money did you spend on becoming profitable at one in the first place? Would you redouble those efforts again to get 2x the opportunities?