I don't know why its taken me so long to do it.
I was also amazed at the relatively small amount you can give 3/4 times considering what one nurse told me; someone can go through 50 pints until they stop bleeding.
I also 'assumed' niavely that they would take more (yes yes I know we only hold 8 pints in our bodies)
Part of the fear of giving was the needle and how I'd feel afterwards. Neither fear is founded.

