New York has laws in place that furniture and bedding to be delivered in plastic bags and the old furniture removed in plastic bags.

Many are plastic and the box needs to be metal and anchored so as not be able to be 'wiggled'.A fan in operation can break a plastic box and come crashing down on the occupants.If you don't know how to properly change the box, get an electrician to do it for you.

Beds and couches should be covered in plastic, remove the pillows from the couch and put in bags to make it easier.

They'll tell you what you've got - type of mold or mildew or whatever.If it's toxic mold, the best advice would be to get a professional remediation company to deal with it.  9 times out of 10, it's not toxic, but you still don't want those spores to spread when you remove the drywall (and yeah, with that big and dark of a patch, I'd remove it rather than try to kill it and paint over it).Wear a respirator.Get a roll of painter's plastic and tack it to the drywall in an area much larger than the area where the mold is.  

They don't read 1 book on how to do surgery and say "I want to do surgery because i saw a show and that's what they were doing".

Start you marketing preperations while the house is under cosmetic surgery so you can start showing ASAP.

They suggesting replacing the cheap plastic ones with the heavy ones with braided covers.

Setting up a single-member LLC is not exactly brain surgery.

romex and plastic electric boxes ...I hope this is done to code. sure you dont need conduit and metal boxes there ? 

That's a plastic do-dad with barbs.