Trying to buy a home without an agent or a qualified inspector is, well... unthinkable.
Deadly Mistake #3: Getting a cheap inspection.
Buying a home is probably the most expensive purchase you will ever make. This is no time to shop for a cheap inspection. The cost of a home inspection is small relative to the value of the home being inspected. The additional cost of hiring a certified inspector is almost insignificant by comparison. As a home buyer, you have recently been crunching the numbers, negotiating offers, adding up closing costs, shopping for mortgages, and trying to get the best deals. Don't stop now! Don't let your real estate agent, a "patty-cake" inspector, or anyone else talk you into skimping here.
InterNACHI front-ends its membership requirements. InterNACHI turns down more than half the inspectors who want to join because they can't fulfill the membership requirements.
InterNACHI-certified inspectors perform the best inspections, by far. InterNACHI-certified inspectors earn their fees many times over. They do more, they deserve more and -- yes -- they generally charge a little more. Do yourself a favor...and pay a little more for the quality inspection you deserve.