I am not you lay preacher friend, but I will note that you label him as "lay" and felt comfortable in teaching him.  Why?

I can use "for it is written" and present opinion, but I am not a preacher nor would I want to be.  GOD sent others to watch over me and do that, actually because of those like you.  I can teach children and the younger, which is greatly needed because of the failure to rebuke the lack of, by those like you.

I am currently researching the Melchisedec Priesthood within relation to destroyed twin cities and forward to the Priesthood of CHRIST.  In Hebrews 5 I see CHRIST learning through suffering.  I see those that take the honor ,  those that should be teachers, but still on the milk and those without the ability to discern both good and evil.  Then I see those unable to understand the move unto perfection in the next chapter and still want to teach.

But I see GOD smile and wink at such.  HE knows who will listen, that gives me comfort and confirmation.