You don't need to release any pressure when compressing the calipers. There really shouldn't be much as there aren't any check valves in the system on our cars. The hoses see a lot more pressure than that when you're using them as it is. What they could have done to damage them would be either allowing the calipers to hang by the hose or bending the old hose too hard.
I do feel your pain though... finding a good mechanic can be hell. These days I couldn't afford a car if I wasn't doing my own work.
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