Slimming world anyone??

I’m trying to follow the slimming world diet but I’m scared it’s really expensive having to buy all the ingredients for everything and no other diet has ever helped me lose weight except the 300 calorie a day or less diet. I’m scared that eating all the food I can eat I won’t lose anything. Has anybody tried this and lost weight In really depressed because of my weight so don’t want to waste my time if it isn’t going to work