NATO's Michael Ruehle lays out how a non-nuclear nation might acquire a bomb or two. It ain't easy.
You will get caught, either by a US spy satellite (as in the case of North Korea), a disgruntled defector (as in the case of Iraq), or even an indigenous human rights group (as in the case of Iran). So what should you do if you get caught? First and foremost, do not overreact. Deny. Should the evidence become too powerful, then, change tack. Create a distraction. Argue that the uranium particles found in your country were purposely scattered by a hostile nation. Challenge the credibility of the information provided to the IAEA. Bring up Israel again.