But what if the app gave really bad advice? I mean some of those plant IDs are just wrong, and then people act on it. It’s less about replacing knowledge and more about spreading bad info fast.

Man, that is the worst feeling when color just won't stick! Box dye leaves behind so much buildup that it basically blocks new color from getting in. I've had friends go through the exact same thing, and it's always a huge letdown. You almost have to strip all that old gunk out completely before your hair will accept anything new. It's a real process, but don't lose hope because it can be done. Just gotta break through that barrier first.

Actually, you avoided the big problem by checking first (smart move). The title says it almost killed your plans, but checking beforehand means it didn't. That timing is the most important hidden rule of all.

Adding a set number of free revisions to your quote, like you mentioned, made me rethink my approach. I always tried to please everyone by making endless changes, but it just burned me out. Now I see that setting clear limits from the start actually improves the working relationship.

How many of us have been there, right? You get in a hurry and think the glue is set, but it's still a little soft underneath. Then you sand and it just gums everything up, leaving that rough, gritty texture that ruins the whole piece. I did that on a picture frame once and had to start the edge all over. It's such a frustrating waste of time. Letting it cure all the way makes such a huge difference, so your friend's mistake is a good lesson for everyone. Patience really is the key.