About 30 years ago I got a phone call from a teenage girl asking if she could come and work for me during school holidays as part of the work experience program run by her school.
People seem to have different ideas of what makes an experienced horse person. I am often told by new students about their level of experience and it always seems to be assessed by the number of years they have been riding.
The goal should be to teach a horse to be equally responsive and soft on both reins. But when there is more resistance on one rein than the other, even contact is not going to work.