I stick with Stop Loss = Always use. You need really a huge account if you will e using Do not use, so you can handle losses. But at the same time having trades on a negative for a long time will bring you just a bigger swap. It doesn’t worth it for me.
I diversify to different currencies but just the major ones – EURUSD, GBPUSD, EURGBP, GBPJPY, and USDJPY.