I have a large (on the order of several year's worth of pay) amount of money currently invested in a few mutual funds that collectively match my suggested asset mix (based on risk tolerance and timeline to retire). But I'm not nearly a finance professional and I don't particularly want to put in the "off time" work to become one when I already have a demanding career.
Is simply investing in a few "major" mutual funds good enough? Is it worth the cost (at least 1%/year) to hire a professional investment manager, or will they just put my money in a few funds like I'm doing now? If not now, then when (as my amount invested grows) will I need to hire a professional?