Can I clean that mold myself? Sometimes people ask that question. The answer is simple. According to the EPA, If the mold affected area such as wall or ceiling is less than 10 square feet, in most cases, you can do the job yourself, by following the Mold Cleanup Tips and Techniques. But, and here comes the problem. In many times you might see only 10 sq.ft. or even less on the outside surface, but when you cut the wall or ceiling you find a lot more than 10 SQFT of mold. So don’t take the chance and call a professional first. Almost all the mold remediation companies are offering free estimate. So take advantage of that and call few of them. I would be amazed that some of them can come up with completely different solutions.

If you choose to go with a professional mold remediation, make sure the contractor has experience cleaning up mold and has great reviews. Make sure that the mold removal company is certified by the IICRC, and ask them to follow the EPA recommendations.
If you believe that your air duct system (HVAC) may be contaminated, it will be good to hire an air duct cleaning company that will brush and vacuum the duct-work.

If the mold damage was as a result of black water such as sewage, make sure that your contractor has the right knowledge to deal with that type of damage.

All mold remediation projects should be done under containment and negative air pressure. If you have health issues, you might want to consult your doctor, and even move out of your home for the duration of the work.