No he doesn't "consider himself an expert." I've never heard him say that. He said he'd "FIND" the best experts. For a businessman over a year away from having to take office, I'd say he was light years ahead of where Eisenhower was, inversely, in his knowledge of commerce/trade/business, or where TR was (who NEVER ran a real business). Every president learns on the job. Governors are notoriously weak on foreign policy, senators great---but usually failures at overall administration. Andrew Jackson didn't know anything about the economy. Lincoln knew far more about business than the military (and was usually ridiculed unfairly for his lack of military knowledge).
What’s his name, the toesucker, said Clinton didn’t even come CLOSE to making a foreign policy decision for his first two years in office.