Adding insulation to old farmhouse

Hi,
Our local NSTAR has a great rebate program for weatherization. I'm going to have a contractor remove vinyl siding and pump insulation into the wall, repair the holes and reinstall the siding. Also going to have him add to the attic insulation.
What should I be careful of in an old 130+ farmhouse? Suggestions or best practices? Types of insulation, etc.
Thanks.
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Does the place have 'modern' electrical wires (Romex)? If you have 'knob and tube' wiring then you can't put any insulation in until the electrical stuff is updated. Kevin

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