Virtual hair colour try-on: what should I trust?

I am going to a small wedding in a few weeks and have started thinking about refreshing my hair colour. I do not want a dramatic change; I only want to look rested in photographs and feel comfortable all day. My brown hair has some brassiness, and I keep saving cooler, softer references that seem balanced with my skin. To avoid a rushed decision, I used virtual colour ideas first. Then I used [url=https://hair-expert.top]this colour planning guide[/url] to rule out options that probably need bleach or frequent upkeep. I am leaning toward a light gloss in a muted ash-brown tone instead of permanent colour. I have never begun a consultation with screenshots, so I want to be very sensible without telling a professional how to work. I would especially value advice from readers who has recently made one subtle change and then lived with it in changing daylight for two or three weeks. What questions should I ask? Should I bring daylight photographs, mention the clothes I will wear, or focus only on reducing warmth? I also wonder how close to the event is too close for a first attempt. My instinct is to leave enough time to wash it and see how it settles. If you have made a cautious change before an occasion, what made it feel low-risk?