By LCHF, just how low a C do you mean?
I had great success with what I considered low C, but what would be considered high C by the Atkins, paleo, and keto folks. I aimed for 40% of less of calories from carbs--low by the standards of the average American.
I was not even trying to cut calories. I just wanted to lower blood sugar, and was trying to see how much changing carbs affected that. However, I found that because the food was now more satisfying, I ended up cutting calories as a side effect.
I picked 40% because (1) it is significantly lower than what I was doing before, and (2) it is really easy to check on a nutrition label--take total calories, divide by 10, and if that number is larger not larger than the number of grams of carbs, the item is 40% or under calories from carbs.
If I wanted to eat something that was over 40%, I would fix it by adding fat or protein. For example, suppose I wanted a ham sandwich. Before I would have ordered that with cheese, assorted veggies, and mustard. No mayo to try to keep the calories down.
On the "40% or under" diet, I would order that ham sandwich as before, but would go ahead and add mayo (full fat mayo...none of that lite crap) and/or order it with double meat. That would raise the calories by about 50%, but it would bring the carb percentage down from about 45% to about 30%.
Not all foods could be tweaked easily to bring them under 40%, but if I ate such a food I would try to pair it with other foods that were enough under 40% to bring the total for the meal under 40%, and if a meal was a little off I'd fix it in the next meal.
You can pretty easily keep a running total of how you are doing, by on a food by food basis keeping track of how many grams over or under you are. So if I had something that was 300 calories and 20 grams of carbs, I'd mentally think "300/10 = 30 grams of carbs to be 40%. 20 grams is 10 under, so add -10g to my running total".
If at the end of the day the running total is not positive, I've met my 40% goal for the day.
To reduce the risk of getting to the last meal or snack of the day and being too far over to correct, I put in some effort to make sure breakfast put me a fair amount under 40%.
A nice thing about this approach is that 40% (I actually ended up at around 35% once I found a diet soda that I actually started to like, and so cut full-sugar Pepsi out) can be done without giving up most fast food restaurants. You might have to give up some items on their menus, but a lot of their main items can be brought under 40% by tweaks like I did for my sandwiches. E.g., if you want a burger and fries, you might be able to get the combo down to 40% of you go for the double burger and extra cheese and mayo. Pizza can be gotten under 40% with enough meat and cheese.
That makes it much easier to stick to it compared to diets where you have to plan ahead for all your meals away from home.
Result: over about 18 months, I lost 140 lbs, and then mostly leveled off. A1C went from 8.1 on 4 different diabetes medicines to 4.8 on no diabetes medicines. Also got completely off cholesterol medicines.