Most people take 4-8 weeks to really get fat adapted. You will feel several differences - you will actually realize you’re not hungry when you normally would be (YAY!), your mind will be clear and sharp, and you’ll have more energy. You might literally forget to eat a meal!
Electrolytes - I would. A couple of bottles of keto aide will go a long way to keep you in balance. More recipes here.
Intermittent fasting (skipping breakfast?) is fine as long as you are not hungry between meals. It depends on how good you get at adding fat, really - because that’s what will keep you from being hungry. If you’re hungry between meals, eat a fat bomb; and make sure you eat enough at subsequent meals.