My 2 cents
Don’t look at the scale for several weeks. When I started, it took two months before I noticed a change in the scales itself. I first noticed changes in how my clothes fit and how I was feeling.
I never use an app either. Never found them to be much use. I just don’t eat within my fasting time… that’s it.
Don’t make it more complicated than it is. Fasting is pretty simple. It will be a rollercoaster LOL. Just stick with it.
I have found black coffee and sparkling water really help me get through my mornings. Coffee for breakfast and a mid morning sparkling water. Make sure to get the ones with no calories tho! Keep a nice balance of protein, carbs, and healthy fats. I do track my food so I can make sure I’m balancing my carbs properly. Too few and I was feeling hungry, too many and I wouldn’t lose weight. I actually do 400 calories for lunch and 400 for dinner with a 200 calorie snack in between. I didn’t notice much the first week, so be patient and stick with it! Good luck!