M3 Thermostat

Hello everyone,
I am requesting info about changing an engine thermostat on my 1996 M3 Evo Euro. ie. is it difficult/easy, expensive/cheap etc. My present one is
sticking open, so that on a clear drive, the engine doesn't reach working temp properly. This is definitely a job I feel I might be able to handle, rather than rack up a huge BMW garage bill!
Many thanks,

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