It's difficult to solder because it has lots of copper and can carry the current it's rated for, don't complain, git gud at soldering.
Try tacky flux, it makes soldering much easier than when using flux/paste/solder wire separately, and your joints will always come out solid and shiny.
Try tacky flux, it makes soldering much easier than when using flux/paste/solder wire separately, and your joints will always come out solid and shiny.