How do you pay? As needed or do you pay monthly? We had a free offer at work for a money manager. I think it was something like $60 per $100K after the trail. I should have at least taken the trail.Trying to time the market is a Fool's Errand. Unless you get lucky, you end up giving money to the Big Boys.
The key is to diversify your 401(k). If you're close to retirement, or retired, you should have already started transitioning a portion of your portfolio into safer investments.
Or pay for a money manager; that's what I did when I transferred my 401(k) to an IRA. To hedge my bet, I told him not to include the value of my home (which is paid off), or my stock account (which I still manage) in any of his calculations. So I still "manage" more funds than he does...
How did you select a money manager? Hard to find someone you can trust.