I recently went through a major liquidity event myself a few months ago (Wombat Security Technologies). Here are some things my wife and I have done: - Get a financial advisor. Make sure that they have fiduciary responsibility, that their job is to help you, rather than just fees. Talk to several different ones and find one that you're comfortable with. Note that you will eventually have to spend a fair amount of tim…
It's a perfectly fine strategy to manage things yourself, as long as you diversify. Be sure to get things that are non-correlated with the market, and diversify over time.
The thing that a lot of people are missing in their "don't get a financial advisor" advice is access. Access to hedge funds, access to some investment vehicles designed to hedge your bets, access to early stage funding of companies. These are things that you would not get easy access to without a good financial advisor.
Again, you can do perfectly fine managing things yourself, so it's basically a judgement call here.