How do I tune my child’s violin without wrecking it?

Use the fine tuners, the small screws at the tailpiece. They move the pitch a little at a time and are very hard to overdo. The strings are G, D, A, E from lowest to highest, and a clip-on tuner or a phone app tells you where you are. (The app our own staff reach for is ClearTune, but any decent tuner works.)

Here is a reframe that takes the pressure off: tuning is part of learning the instrument, not a chore that comes before it. A true beginner cannot tune a violin for the same reason they cannot yet play one. They do not yet know what the right note sounds like. That is normal, and learning to hear it is exactly what the lessons are for. Teachers tune at the start of lessons precisely because it is a skill they hand over gradually, usually somewhere in the intermediate years.

Leave the pegs alone. A slipped or over-tightened peg is the most common reason violins come back to our bench, and a snapped string or a peg forced into the pegbox is a repair, not an adjustment. Pegs are for the teacher, or for us. Tuning takes us seconds any time you are in the shop, and if the instrument has gone badly off between lessons, that is exactly the kind of visit we are here for.