7.25 pinion seal replacement questions can't get the pinion nut off

I used a dremel tool to make a notch on the pinion shaft, the nut and the yoke. I used the impact wrench just to loosen the nut. I carefully counted the number of turns to remove the nut. Upon reassembly, I put the nut back on with the same number of turns until the notches lined up again like before. I used the impact wrench to tighten the last turn. It was good the notches lined up because neither the impact wrench nor the breaker bar could get the nut to turn anymore. The impact wrench was from Harbor Freight and did not have a high torque rating.
Did I do it right?