No, Donald Trump will not likely be able to avoid conflicts of interest. He has such a vast portfolio of financial interests that it would be nearly impossible to avoid conflicts between his government position and his business interest. In addition, he seems to have very little interest in avoiding conflicts. He just wants to say that conflicts of interest are impossible for his position.
Donald Trump's children have already been reported as making business deals when accompanying their father on official meetings and selling access to the president-elect during his inauguration. This behaviour, so early in the day, suggests that Trump's children will monopolise on their father's position and will make no attempt to minimise conflicts of interest. In fact, the evidence suggests that they will actively seek them out.
Even if Trump did understand what a case of conflict of interest entails, it would probably take him all of the four years of his Presidency to get rid of them. So he's just going to avoid getting rid of any existing conflicts and maybe, just maybe, he'll proceed carefully and avoid any new ones.
Donald Trump will continue to hide behind the vague law that states that the President cannot have conflicts of interests rather than addressing his actual conflicts of interest. The law was not written with men of such low moral character in mind, and it will lead to hitherto unseen conflicts and hypocrisy during the Trump administration.