OP, I tried Low Carb Healthy Fat for a one month trial in March 2016 because I had 100lbs to lose and knew traditional low fat dieting didn't work, nor shakes and meal replacements. I was so desperate though because I loved carbs particularly sweet taste and didn't believe I would cope at all.
To my amazement I found I enjoyed it and still practice it today. After initially missing my fave carby foods, within a couple of weeks the benefits kicked in.
I discovered that..
Carbohydrates make you hungry so you need to eat snacks between meals (usually more carbs).
Eating good fats like butter, lard, cream, olive oil, coconut oil actually DOESN'T make you fat (unless combined with carby foods), rather it satiates you for hours so you end up eating less overall. I haven't had to snack between my two meals a day for 29 months. Awesome!
Cereals are not healthy nor are processed foods, particularly anything labelled "low fat" Avoid!
"Eat less move more" doesn't work either. I tried this over and over again for 40 years. Exercise stimulates appetite, eating low fat diet foods makes you hungry so it's a double whammy. No wonder I failed multiple times.
I planned my first weeks menus by going on dietdoctor.com. Check out the huge selection of articles, advice and experience from others who have tried Low Carb. I can't recommend it enough.
Why do I still eat LCHF 29 months later?
No hunger, ever. That NEVER happened doing low fat diets.
Eating using fat is awesome, food tastes so good now and fills me up for hours. For example last night I roasted salmon and had it with my own coleslaw and a cream sauce made just with double cream and tarragon. That'll keep me going until lunchtime today where I will have a cheese, bacon, asparagus omellete.
OP, you know that slimfast won't work so have a look at the dietdoctor site, read some articles, do some research. Think about it, plan your weeks menus, take the plunge.. good luck!