Im left handed and play right handed fiddle. I dont have any problems.

When I was taking lessons in Europe as a kid, no music teacher
would even think about teaching a student left handed violin.
the only people who learn left handed fiddle would be folk fiddlers, some play the fiddle with the strings as they are for right handed folks (eg Ashley MacIsaac) and others re-string for the left hand. (In which case you can never try a right handed players violin)
Id say more than anything a left handed fiddle player has an advantage as there is a lot more dexterity (I hate that word) in the dominant hand - ie. the fingers.
petr