“I would say that the most important policy regarding search optimisation is never allowing your programmers to try any kind of SEO at all.”
A free tip for business owners, you need to be aware of what your internet staff are doing, because programmers are constantly learning new methods, new techniques and tips from each other and from the web. “They would not give a second thought to using this new but perhaps untested and dubious technique on your live website just to hone freshly acquired skills or to appear to be a bit more professional in their own minds.
Afterwards, if Google blacklists you, the only thing to do is to close your old domain down and start again, fresh.
My advice to company’s seeking an SEO Consultant
Check the SEO company you intend to use is listed on Organic Search (not PPC or Adwords) on Google for what they do, check out a few common keyword terms, if they cannot get there own site listed, how can they do yours?
Ask for references from clients they have done work for.
If your still unsure, leave them alone and find someone else.