I've tried to do this myself before, I think I even replaced a flush myself once. What I learned in the process was that if I only have to do this every 5yrs or

I've tried to do this myself before, I think I even replaced a flush myself once. What I learned in the process was that if I only have to do this every 5yrs or whatever and I don't have the tools or knowledge to do it myself, working out how to do it is far more expensive than just paying a guy to do it. I think the last time it cost about 50 pounds (UK). If you know the exact mechanism, you will find someone on Youtube giving a demo that you may be able to follow. However I often find there is some key difference you won't have thought of or don't have the tool to deal with. Hence I don't think robots will be replacing good plumbers any time soon.