When teaching someone how to do something, you have to let them get it wrong.
It may be easier to jump in just before the mistake, error or failure occurs and rectify things. But this brings little benefit in the long run.
In the short run, the person may feel supported which is a good thing. But too much support leads a lack of independence and self-reliance. Instead they become reliant on you being there.
It teaches the person that they don’t have to work things out for themselves because someone will come along to make things right. It may also lead to this person not trying because you’ve showed them that you won’t allow them to fail.
The reason you step in before things go wrong is because you want them to get it right. However, you have to give people space to learn things for themselves and that includes getting things wrong.