I say need a helper because of the weight of the old system, as you guessed it. You could pull it off alone if you cut it into small pieces to take it out. It took us a lot of beating on that old slip fitting (between the catalytic converter and muffler) to get it apart; that was definitely the worst part of the job. Putting the new stuff in place is relatively easy.
Also, forgot to mention, slip fittings almost always leak. I took it to a muffler shop after I was done and had the seams welded. Surprisingly, though, the old rubber hangers were still in perfect shape.
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