It sounds like you have a lot going on with the retirement, so just take some time and set up a mtg with your work 401k administrator to answer a few questions before you leave:
1. Can I take withdrawals, and how often? How is this done?
2. Am I limited to the current investment options as when I was working? (Probably yes)
3. For potential rollover, do they allow in-kind, or do you need to first convert to cash?
4. What are administrative fees if you leave the money in the 401k program? These are different than the individual investment fund fees.
I have all my savings with Fidelity, and been happy with their support and service. I did a few rollovers to self-directed IRA from various old work 401k/403b accounts. Nice thing about Fidelity is if you are near one of their offices, you can meet with an advisor who can help you with all of the rollover paperwork. Essentially you bring in your work 401k paperwork, and fill out some paperwork at Fidelity, and they do all the work to complete the rollover. At your level of funds you meet Fidelity Private Client status, Fidelity will offer investment advisor services free, to help you with any questions and some recommendations for your portfolio. They won't provide specific investment choices, but they will talk about asset allocation (AA), risk tolerance, monthly income needs, upcoming RMDs, estate planning (general, not formal lawyer), and more. The advisors are certified financial planners (CFP) who can help you out. BTW, Fidelity will likely also give you some incentive to move your 401k to a Fidelity IRA. That incentive could be around $2500 range I have heard. They will also push for their paid FA services, but you don't have to take that. You can get the advisor for free, and still get good customer service and advice.
I believe you can do just fine as self-directed and not have to pay any FA fees. Keep it simple as the three fund type examples. Go with low fee widely diversified funds that match your desired AA. You can do it, especially with some initial help fro a Fidelity advisor. Or whatever company Vanguard, Schwab are both good alternatives. I just like the Fidelity sticks and bricks offices where I can go to get things done in-person. You can probably get your in-laws to review your plan for free or maybe for a small fee if you want second opinion. Or discuss it here on E-R.org and you can get some great advice.