Wear a respirator with organic vapor cartridges as you apply it.

Wear a respirator as it is a really fine powder.

We wore disposable hazmat suits and used respirators.

Make sure you follow the RRP guidlines (respirator, spacesuit, plastic tarp, warning signs, etc) or do the work on the DL on the weekend.

I'm looking to pick up a paint brush or roller as little as possible here.I have an organic respirator and some good goggles, but is there anything else I should consider so I don't become another "Tim Allen" statistic?

Because they may have used some lead in the paint, you should seal off the room and use a respirator of some sort and remove any clothing for cleaning before you track it into your home.

For the tub:  Go to Home Depot or Lowe's and buy a nice respirator. 

WEAR A RESPIRATOR WITH ORGANIC VAPOR CARTRIDGES.The new stuff will usually blend well enough into the old stuff to pass muster, especially on a parquet floor with all the variations in shading.

.* to neutralize muriatic acid just pour some baking soda powder into it, stir and it will neutralize it.You should wear a respirator or mask while working with or neutralizing muriatic acid to avoid breathing in fumes

You can wear a painters suit and 100%cheap respirator to protect yourself if you choose.