You either need to hire someone or spend a fair amount of time learning. I am a CPA but I haven't practiced in years. I've been in an executive position that requires financial knowledge but no tax knowledge for over 20 years. I'm in a very similar position - I'm 54, want to retire early and almost all my wealth is in my 401k or similar type of account.
As I have focused on retiring this past year, I've learned a lot. It was obviously very helpful to have once practiced as a CPA so I certainly understand taxes, however, there are a lot of things to consider and it takes a lot of time for it all to sink in and a plan to come together. Someone who does this on a regular basis could certainly do it quicker than I but I think after about 6 months, I have a pretty good understanding on how the taxes will work as I draw out the tax differed money.
One thing that I learned is that I should have saved more money in an after tax account or if/when my income would have allowed, taken advantage of a ROTH. When trying to minimize the taxes, having a few more options for drawing cash would definitely help.
One thing I'm grateful for is that when I was 20, I married a 25 year old. When I turn 55, my wife will be exactly 59 1/2. I wish I could say I planned that. Personally, I would probably not retire if I couldn't draw down my 401k without penalty. Note that there are ways to draw from the 401k without incurring a penalty. I forget the code at the moment, but basically, you have to take equal withdraws based on your life expectancy. One more thing you'll have to learn or get advice on. Personally, I'd work part time until 59 1/2 had I not married so wisely.
The other thing you need to get informed on is Social Security. I always thought the best thing to do was for me and my wife to wait until 70 or at least our full retirement age. However, having run some calculations, it appears the best formula is for me to start at 62. Wife will be 67 (full retirement age due to me marring well) and she will file and suspend. She'll take half of my SS until 70 at which time she'll switch over to her full SS and we'll ride that out. I never knew any of that a couple months ago and it's not something I ever came across when I was doing taxes as a practicing CPA. So again, you'll either need to learn or get advice.
Best of luck on your journey.