DIY Foam Insulation

So has anyone done a DIY Foam insulation on their (or anothers) home?
I've been looking at insulating my 1874 victorian for a while, and think foam is the way to go. (high R per inch, blocks air infiltration, etc) I'd rather not tear off the plaster or siding to do this, so i need something that will install via "plugs".
My grandparents had some sort of foam injected in their walls a long time ago. I have no idea is it was the Urea Formaldehyde foam or what... all i remember it that it cured white (and who knows if that is an incorrect memory) and my grandma said it made a huge improvement.
I've called around to most of the local insulation companies and noone seems to do retrofit foam. is the only place i've see that will supply a slow rise kit (suitable for a retrofit installation) to general public. They have instructions that make the process look like it is something within my capability.
Does anyone know of any other places which will do/sell the retrofit foam product?
If you've done the DIY foam route, was it particularly difficult, and what would you do differently?
What about other insulation technologies? (the only one which seems appropriate is cellulose, at about 4/7ths the R value)
be safe.
Ich habe keine Ahnung was das bedeutet, oder vielleicht doch?
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