The simplest approach unfortunately involves brutal honesty (most people can't do this).
Don't change anything but for a week record in a log *everything* you eat or drink.
The most obvious change then is to remove one item or type of item you eat (or drink if contains calories) outside of mealtimes - in my case it was biscuits and the job was done. it won't necessarily be one thing, but you know from the log where the excess fat is.
Some people claim to not eat at all outside of mealtimes, then you have to look at portion size. The problem with going on some kind of radical weight loss program is - can you keep that style of eating up for decades ? What is the plan when you stop? Much more logical to make sustainable modifications to the actual way you eat.