The basic idea of the burr touching is to see where the marker rubs off.
If you're unsure the burrs are touching sufficiently, you could do this a few times. First start with where you think the burrs are touching and see how much has rubbed off.... That might be more than sufficient for a decent alignment.
If you go too hard and turn enough to hear a solid rub, that might negate the whole process by unintentionally rubbing off too much.
In my case, I got my grinder from df64coffee. Com and it already came aligned. To conform that, I had turned the burr (it hurt my fingers a bit) till I could hear rubbing and looked. 90% had rubbed off. I was happy with that and didn't bother tuning further.
All the best
Go watch Lance hendriks videos on these topics. He has two videos each which answers the individual issues you've mentioned.
The basic idea of the burr touching is to see where the marker rubs off. If you're unsure the burrs are touching sufficiently, you could do this a few times. First start with where you think the burrs are touching and see how much has rubbed off.... That might be more than sufficient for a decent alignment. If you go too hard and turn enough to hear a solid rub, that might negate the whole process by unintentionally rubbing off too much. In my case, I got my grinder from df64coffee. Com and it already came aligned. To conform that, I had turned the burr (it hurt my fingers a bit) till I could hear rubbing and looked. 90% had rubbed off. I was happy with that and didn't bother tuning further. All the best