I did mine with a snorkel and a couple of wrenches. Mine is in 11 feet of water, the chain rusted out. I bought new shackles and about 15 feet of chain at Heath's Ace. I opted for stainless steel chain and hardware this time. It took me about 4 or 5 dives, I went about 45 seconds a dive. I probably could have gone longer, but I'm no spring chicken either. It's not hard, but doing it under water holding your breath makes it more of a challenge. I think Center Harbor dock will do it for you, or any of the other dock companies. Not sure what they would charge.
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