I have fine hair too. Now, I think there is a big difference between normal shedding and then shedding that comes from dry hair, tensioned pulled hair and over manipulating your hair during twisting, hard combing and tugging your hair during moisturising. I used to have these problems and I never knew that I was the culprit. I am transitioning again and since I co wash everyday and detangle in the shower I don't have these problems anymore, I see just like 5-10 hairs a day as opposed to when I was seeing 20-80 hairs daily. If you see lots of shedding you may have to do a bit more deep conditioning and trim a bit. I started off with shaved hair and my hair is in a good place now and my elasticity is very good so I doubt I will have to do any trimming for a very long time.
Best,
Almond Eyes