Lead pipes is NOT THE SAME as lead paint. The Lead paint itself is relatively harmless, it's the DUST that it produces that can be harmful.
Also, we need to separate the difference between ACTUAL risk levels versus PERCEIVED risk. I agree that most of us grew up in houses that contained some amount of lead based paint. Did it affect us? Well, not as far as we know.
The issue for contractors is, the EPA DOES think it's a significant issue, and will fine you over $32,000 PER DAY if they find that you are not in compliance with the regs. It doesn't matter if you disagree with them, or think it's a non-issue. The EPA has already started to fine contractors, starting back in early 2011.
As for homeowners performing the work, I suppose it depends on how long you plan to live in the house. Something to consider is resale. As mentioned above, when you go to sell the place and the potential buyers look at your place and say "Hmm, 100 years old, looks like you've remodeled recently, who did your RRP work?". Again, it's all about perceived risk. Some people may be like-minded, shrug their shoulders and say "oh well, no big deal".
Then there is the crowd like a customer I worked for last summer. My helper accidentally broke two CFL bulbs in an unfinished attic. I drove to the home center to buy two new CFL's to match the ones my helper broke. The customer met me at the front door and just about lost her mind. She was just barely able to restrain herself from screaming at me, going on about all the mercury that was released into her house, and how would we clean up the "toxic waste" in her attic?
Granted, the EPA is not going after homeowners. But what about the people you sell the house to? When their baby grows up and develops a learning disability and haul you in front of a jury, which side do you think will win? The disabled kid will win 100 times out of 100.
Anyways, I'm not trying to dissuade anybody from working on their homes. Just practice safety. Follow the EPA guidelines. Cover your butt. Wear the Tyvek suit, wrap everything in 6 mil plastic, and document EVERYTHING. Whenever I start a Lead job one of the first things that I do is document that there is already Lead in the soil, because if you live in a metropolitan area there WILL be Lead in the soil, and you need to document that it was there prior to your involvement.
The negative pressure idea is a no-no, unless you are filtering the outgoing air with a certified HEPA filtration unit. The list goes on and on....
As for the Asbestos thing, hire it out, hire it out, hire it out. If you do try to tackle it yourself, buy a vac designed specifically for asbestos, and either sell it or dispose of it when you're done. My guess is that Festool is going to tell you that, in the North American market, they do not recommend the use of any of their dust extractors for Asbestos work.
I'm not trying to be a party pooper here, but there are potentially HUGE criminal and civil liabilities here, and any project involving Lead or Asbestos should be undertaken with a high degree of caution.
Thanks!
Best,
Tom
(stumbles off of soapbox)