Brass will get hard from being worked. Whether it is being severely necked down or up, or just being loaded over and over. Annealing re-softens the brass and allows it to be used longer and resize properly.
All you really need is a cordless drill with a socket attachment, a deep well socket that the brass will slide into, a pan of water, and a propane torch.
Here is a you tube video I found depicting basically how I do it.
https://www.youtube.com/watch?v=kgD5D0Wzu-c
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