How is it like to be a blood donor?

CubsterShura
Since I was little I wanted to become a blood donor when I become an adult. But two years ago I myself had severe shortage of blood and almost needed blood transfusion myself so I decided not to think of donating until I am in a better condition.

How do they test if you are fit for donating blood? I wonder if I can do it.
How is it like to be a blood donor?
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