Geth install problems on mac

Hi -- I'm new to ethereum and trying to figure out how to get it to work on mac. I installed Geth, but I can't get anything to work. When I run the command "geth", I get the following response

dyld: Library not loaded: /usr/local/opt/gmp/lib/libgmp.10.dylib
Referenced from: /usr/local/bin/geth
Reason: image not found
Trace/BPT trap: 5

I would like to know how to
A -- fix this problem
B -- uninstall if necessary. I realized I should potentially be using a test network, not the actual network. Could anyone tell me how to uninstall?

Thanks for any and all help!
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