I'm pretty good at saving but I'm a lazy, hands off investor. I now have four 401(k)s. Three at former employers. Two of those accounts have changed hands many times. After I finish KonMarie-ing I want to get my financial house in order.

How do I do it? What do I need to know going into it? I probably don't have account numbers and passwords. What do I need to consider? I've built this up in my mind to be a big deal but I don't have a sense for how much work it's going to be.