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@disq
What I've found about Shimano hyros (with my limited experience with RS505 and R8020 levers and building/bleeding my own bikes so far, not a mechanic) is they're straightforward if you follow the instructions and take extreme care on using genuine and correct parts. They have two different sizes of olives/barbs and two different diameters of hoses (so far and AFAIK). So if you use an undersized hose or third party olives there'll be some chance of failure.