depends if you can obtain the correct fluid,like what they use then give it a go.
i still dabble at work and we use safegaurd chemicals,i dont know if they sell to the diy market??
what needs treating?
YOU NEED THE CORRECT RESPIRATOR and coveralls,gauntlet gloves and a hat if you decide to go down the diy route

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we used to turn off the electrics apart from the cooker socket,and run everything off of that,pump and lights,that way when the fluid starts flying everywhere your not filling up the ceiling roses and jb's when its live.
if its the whole house then it might be worth getting them to do it,this way you will get a guarantee,
when i used to do it,we use to brush down all the cobwebs/dust in the attic,lift all insulation,spray rafters 1st,the joists get a lot of fall out.then spray all the joists. relay insulation,when we finished it looked like the roof had only just been built it was that clean,BUT its a 5hit job to do
when it comes to the floors we used to lift every 5th board and with a broad spray make sure you manage to everything,underneath as well.
stairs,drill a couple of holes in the risers(thats if it is enclosed)and using a stair sprayer.
ground floor,if your really lucky and you have enough gap between floor and oversite then get under the floor and spray from underneath,that way you dont have to disturb the boards.