It can be fine if most days are easy and short. Beginners usually do better with three or four runs a week and one rest day after a hard effort, because bones and tendons adapt slower than your lungs. If something hurts for more than a few days, rest. Easy days easy, hard days hard. (more)

Short blocks with a timer (25 minutes on, 5 off), phone in another room, and a written goal for each block. Ending each session by writing the first task for tomorrow makes starting much easier. (more)