This story is part of Money magazine's special Dream big, act now: Six secrets of retirement, which lays out the key drivers of retirement happiness -- including your investments, health, career, family, midlife changes and...

From the years you spend tending to your portfolio to the time when you finally get to enjoy sweet success, you face questions about what to do. Ace these and prosper.

Are you happy with your 401(k) plan? According the Investment Company Institute, the mutual fund trade group, the answer is a resounding yes. In a just-released survey, the ICI found that 73% of households are...