Thank you all so much for replying with really helpful stuff.
It stung a bit today too so I will try my stomach next I think and then move on to thigh. For some reason I always think it will be more painful in my thigh but may be not from what quite a few of you say. Will watch a few more videos too.
I've found it's better not to massage area after injection as that hurts momentarily and bruises.
The Methylcobalamin is not very thick so the insulin needle works quite well. I did wonder though if half inch length was long enough?
Is anyone else injecting Methylcobalamin? It's better for me only because it contains no preservatives. Although you try anything when desperation hits.