Homemade double boiler?

I'm making these chocolate things for my mom's birthday and I need a double boiler. The problem is that I don't have one. How do I make a double boiler using only common kitchen pots and pans? Is it just put a small pot in a big pot. Does it cover the whole top or do I need to leave a opening to let the... show more I'm making these chocolate things for my mom's birthday and I need a double boiler. The problem is that I don't have one. How do I make a double boiler using only common kitchen pots and pans? Is it just put a small pot in a big pot. Does it cover the whole top or do I need to leave a opening to let the steam out? any help at all will help. thanks in advance
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