I must say right away: losing weight locally (only legs, only waist) will not work: everything will lose weight. But after losing weight, you can do strength training and gain muscle mass where you need it.
To get leaner, you need:
The thickness of the legs is unlikely to be greatly reduced without surgery, but it is quite possible to pump up the leg muscles so that the legs look a little slimmer and look fit! Find exercises in Google and go to battle, the main thing is not to retreat and do not wait for the result in a week;)
Indeed, it is impossible to lose weight locally, but the approach may be special.
The solution seems to me like this:
For the systematic loss of excess weight, it is enough to engage in cardio exercises 3 times a week for 40-60 minutes. The most energy-intensive way is running and jumping rope.
And in order not to lose weight in the upper body, it is enough to swing it 2 times a week. Moreover, you need to do exercises only on the upper body. This will help maintain muscle mass above the waist. In total, we get 5 workouts per week. Strength training and cardio workouts are best done on different days.
Alternatively: Mon, Wed, Fri - cardio workouts. Tue, Thu - strength training (possible at home).
Food. The most effective, in my opinion, is five meals a day, in small portions, complex carbohydrates before 16:00, proteins after 16:00.
wrap with anti-cellulite cream (very good and inexpensive "Vitek");
Excess weight cannot be lost locally (unless you get rid of a limb ...)! Forget about this misconception forever.
And in general, the most effective way to lose weight (and most importantly - to maintain the result and, in principle, to improve health) is sports and proper nutrition, but by no means diets and much less hunger.