I did it couple days ago. It remains at 50mcg as I am transitioning off HU. I did at home so no experts were watching.
I had none of the mild flu like symptoms that resulted from shot #1. While that effect shows the INF working as my Dr confirmed I guess that not having it on the 2nd shot is a good sign for tolerance.
I tried pre cooling the shot area as suggested by Wyebird. It reduced the discomfort of the cold liquid and allowed less warming up of the syringe. I figure less temperature cycling on the syringe stuff should be preferred.
Last month was an "off" one for me, I get extended good and worse periods, good ones tend to be shorter than "off" ones. I hope to see some slow improvements as the INF takes hold.
My 3rd dose will be back at Dr office. I'll get my bloods at that point. I think it may increase to100mcg then.