Might consider some rust penetrant on the bleeder valves and the metal line where it enters the rubber hose. I always try to do that a day or two before you disassemble. Hit it with penetrant a few times if you can. Nothing worse than breaking off a bleeder valve or destroying the metal line. Use line wrenches also. Would definitely flush all the old fluid out when you bleed it. Your already there and a large container of brake fluid is cheap. Always keep in mind brake fluid destroys paint. I always put shop towels under the master cyl. in case any fluid gets spilled etc.