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Hollow .stl file HELP!

Hello friends!
I really need your help. It happens that I received a .stl file from an sculpture that I really want to print. The problem is (as you may guessed) that it is a solid figure and the time and money to print that out is HUGE. I want to hollow the file and I don’t have access to the original 3D file (only to the .stl file).
Considering that I’m basically a newby in this matters, how could I do it?
(The size of the file is about 100 MB)
Thank you all. Best Regards,
-Mike

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