The kit instructions need to be CORRECT from the start !!!!
This is how I got involved with instructions in the first place and found many things that needed to be changed.

A slip of paper could get lost or, not even noticed, if the instructions are WRONG they should be changed immediately, for the sake of a couple of pennies, is it worth it.

Also. group leader should be familiar with rocket building and the NAR safety code followed.

I have done many rocket building sessions where tje kids say "I know what I am doing" won't follow the instructor or read the instructions, and when their rocket doesn't look quite like the package or doesn't "work right" they are discouraged and don't want to conyinue in the hobby.

It's the "instant gradification" that has resilted in RTF's. Some good old building techniques with the parents participating is what we need.

Prototypes can't be tested enough as far as I'm concerned, if the release date needs to be extended, so be it, work the bugs out first, then release it.