A pull-cord or pull-pin detonator doesn’t really take a lot of practice to get right, whereas flying an aircraft as a piloted missile does.

The act itself is initially enforced with the payment of family debts, which is one reason older (generally under 40-years-old though), debt-ridden Muslims are chosen and approached by, in Palestine’s case, the Hamas. A man who has recently lost a good portion of his livelihood would be an excellent candidate.

The meeting would be followed by the indoctrination Tom mentioned, which would basically be religious in nature, reinforcing the man’s own belief with little-known pseudo-scripture, assuring their latest victim that what is planned is most assuredly right in the eyes of Allah, and that all Jews must perish. A wavering resolve will prompt the reminder that his family is being well cared for during these troubling times, and that they would be handsomely rewarded once his task is complete. Any further slippage from the straight and narrow path of the martyr-to-be would result in serious threats of bodily harm, even death at the hands of the Hamas, and the assurance that his family would remain severely in debt, with no provider and no reward. It is very possible that the bomber’s resolve might be further fortified with similar threats directed toward his wife and children.

Mind-altering drugs probably help.

That’s how you train someone to commit suicide, and to take as many strangers with him as he can,
Dan