Yup, it time to replace it now. Green is corrosion, and half gone contacts are worse. Intermittent connections, and probably some arching at the contacts.
To answer your question, no, it's not hard to replace. A new one can be had at any good auto parts store, or RV dealer. The schematic for the correct wiring to the new plug is on this forum, and probably with the plug instructions.
You'll need wire cutters/strippers, a sharp knife, electrical tape, even liquid electrical "tape" would be nice. Also get a tube of dielectric grease. squeeze some in the connection recesses, and you won't get the "greenies" again. Just don't choke when you see the price of the grease. It's fairly expensive, but a tube will last you a long time. Mine is going on 12 years old.
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2012 Jay Flight 19RD
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2010 Tundra TRD DBL Cab (Traded)
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