Good for you - good deals never come my way 
I've only changed fresh tanks over, never sw, but I would put the lr in a rubbermaid with water from the tank, put the fish in another rubbermaid with water from the tank, put the substrate (if you are going to reuse it) in a rubbermaid with water from the tank. Move the new tank where you want it, and reverse the process. I think that if you are reusing the substrate and lr then you will avoid a cycle.
If I remember, it took me most of a day to change my 30 gallon over to a 55 gallon. Take your time and enjoy the new tank.
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55 gal. reef. Coralife lunar lights 4 x 65, 120 lbs live rock. Remora skimmer, 3 power heads. 2 tank raise false percula,2 pajama cardinal,hermits, snails, Xenia, leathers, mushrooms, polyp frags, yellow sea cucumber, And last but not least - the miserable mantis.
Terry
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