I commend your attention to doing things right, but don't let it keep you up at night. Test daily, and you'll learn a lot about the process.
You will see your ammonia spike, then drop inversely to a big rise in nitrites. That will peak, then they too will drop way off to zero and you're done.
Leave the water changes until your done and don't sweat the details. Nature will make this work, regardless of how you try to influence it. Just sit back and enjoy the process. Once it's done, you'll be a pro.
Get that guy a cap and a speedo!