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I'm currently looking into removing my left arm but can't find a way, how does anyone know how I could? (I'm from UK)
Technically yes. Realistically absolutely not. You won't be able to find anyone willing to do so. Prosthetics are still far behind even being able to argue that you wouldn't lose quality of life.
I would be shocked i you can find someone in the UK willing to do it because I imagine the NHS would have quit the fit.
I don't think you can successfully DIY this, but apparently some surgeons will do it for money. https://nypost.com/2015/09/06/this-strange-condition-makes-people-want-to-hack-off-a-healthy-limb/