I’m sure this varies from person to person, but I found it quite difficult. Some months ago, I began having bad pain and swelling in my left hand. I thought for a while that i would no longer be able to use my left hand to play, as my fingers were too stiff to finger the note. I would generally have a period of flexibility in the evening, but the flexible window got smaller and smaller. So I got a cheap left-hand violin and started experimenting with it. To me, it was like playing a completely different instrument. I felt like I might as well be playing banjo or bazouki, as nothing seemed to carry over from my knowledge (beginner level0 of right-hand violin playing. Fortunately, my left hand flexibility has been restored with arthritis treatment. I think if I ever lost function in the left hand again, I would be more likely to turn to trumpet or some other instrument instead of left-hand violin. To me, it felt very awkward to bow with the left hand.
This is just my experience; I know that others have successfully transitioned from right-hand to left-hand playing.
I am sure which ever way you start to learn violin (or any instrument) is the way that will be normal for you. Everything feels strange and awkward when we start to learn, over time it becomes so natural that we forget how we struggled in the beginning. I guess it just depends on how much time and effort you put in it. 🙂