m0useanswered grow question 1d ago If your potting mix or soil is dry it is useful to give it a good soaking a day before hand, you wnt the roots to have areas to explore that are moist and won't dry them out.
I don't know if you have to treat all of it with rootjuice. I would just use the water you will give it after a transplant for that.
You could however mix in a product into the transplant hole that does the same thing, most of that stuff need contact with the roots to be effective.