Debugging shared object modules with GDB

I am relatively inexperienced with the intracacies of Linux Shared Objects,
but need to do the following;

I have a test system running on Linux with a shared module that I need to
debug. How can I create and debug a version of this module.

I am thinking about adding a main() to the module with an endless loop. Then
compile, and run it. I'll add a break on the function I need to debug, then
run it.

What I am not sure is how to 'unload' the existing module, so my debugged
version will be used.

Am I heading in the right direction, or is there a better way?

Many thanks in anticipation
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