Depending on one's particular risk averseness, income needs, or desire for greater growth, she or he can put any desired percentage of holdings into each set of lower to higher risk assets. One should have little difficulty achieving an overall 5% or better yield, while also likely enjoying some investment growth and overall portfolio volatility about the same as or below that of the major market indexes. There are no guarantees in investing, though, and each investor should do his or her own research and/or consult with a preferred financial advisor prior to such purchases.
I would recommend that the asset sets be rebalanced to within a certain threshold (such as 5%) of the desired allocation percentages about once a year or after one's equities have fallen or risen more than 5%. (Some suggest no portfolio adjustments until there has been a rise or fall of 10% or more. I think it is a matter of personal choice. Either level assures that one is selling when prices in the now increased market value set are higher or buying when those of a now decreased market value set are lower.)
Other than this periodic tweaking of the nest egg, one may hopefully just sit back and enjoy growth and income with, as the Aussies like to say, "no worries, mate." With any luck, the main concern will simply be: "What do I wish to do with all this extra income?"
Ah, would that things were that simple! In fact, since both the economic environment and individual assets may change in the intervening period, it would be well to also review one's holdings every now and then, either completely on one's own, if comfortable with the issues involved, or with assistance from a professional.
Where to Find the Best Yields. Jeffrey R. Kosnett in Kiplinger's Personal Finance, Vol. 60, No. 8, pages 43-46; August 2006.