Everyone I talk to, who needs to service their cooling system, I always try to encourage them to do it themselves. Unless they are retarded, and I really don't think they are smart enough to accomplish it. Of course, I would never say that to their face. Flushing is super easy.. I have done it a few times, it isn't the least bit hard. And in the end, it is worth every bit of the effort. Especially when you removed 1ga of pure scale and gunk that smells like 5 year-old [fermented] cat ****.