My dad is LH and so is my DIL. She had never used LH scissors until I bought them for her. She was amazed. She is a surgeon and I think that must be the most difficult because surgical tools are right handed.
Maybe I should have been LH because I do several things LH without even thinking about it. I can use a rotary cutter with either hand. I can pin and unpin with either. It was pointed out to me years ago at work that I did things "backward" for a right handed person.
But, I know nothing about LH thread.