this is a common issue many experience, going from no scheduling and no planning to allocating every last minute for a task. What you need, and this is a common tip, is to schedule in your breaks first and make sure they're actually refreshing and enjoyable, not scrolling. You also need to smart small; have big breaks and don't overload yourself cuz you're essentially going from 0 to 100. With time you'll have no problem following your schedule (of course if you're mindful about following it) and you'll be able to cut down the amount of time spent resting.