littlebillie I understand your worries, I was exactly the same at the beginning because I've been told all my life fat is bad, carbs are good.
The way I got through it was to literally throw the book at it. I researched relentlessly in the first few weeks. I read Gary Taubes all the way down to Michael Pollen and even some vegan advocate books from my friend. I've read every single side of the scientifically minded diet argument (I avoided daddy crap like alkaline diets and superfood bullshit), looked at the raw studies (this took a week, 4 hours in the evening. Horrible) our dietary advice is based on in the UK and there's genuinely, genuinely only one conclusion you can draw from all of it:
There is no magic diet.
There is no right way to eat.
That's all.
However, overwhelmingly the evidence both epidemiological and lab based suggests that a diet rich in carbohydrates directly results in obesity. The correlation and the lab based evidential trials show a stronger relationship than cigarettes and cancer.
A book called 'the big fat surprise' is essentially a number of studies pulled together and reviewed, and it's a great one to read if you're struggling with the idea that fat is nutritious and essential to a healthy lifestyle.
If you're anything like me, hearing this will mean nothing and you'll need to go and find the research for yourself to believe a word of it 
.. all I can say is do it. I used my skeptacism for a long time to put a wall up and protect myself from failure.
'I didn't fail on low carb, it's a dangerous way to eat so I consciously decided not to do it anymore'.
My biggest break through moment this whole time was the day I used my audible subscription to get 'why we get fat' by Gary Taubes. It wasn't the book, it was the decision to educate myself instead of using the 'its a fad diet, it's supposed to fail' reflex as a reason to stop.
I didn't stop and I won't stop because now I KNOW this WOE isn't a bad diet or a fad diet, I know it's healthy and now thinking any other way just feels like I'm cheating on my intelligence.
Last thing, you are not the only person who's thought about the consequences of low carb high fat diets but I'd encourage you to go and research as much as you can from REPUTABLE sources. If it's not published anywhere other than online, it's probably bullshit.