Where you feel it tells you where it is
A vibration complaint is much easier to act on when you can say where in the vehicle you feel it, and most people have never been asked.
Through the steering wheel. That points at the front of the vehicle. A front assembly out of balance transmits directly up the steering, which is why it is the easiest kind to notice and the kind people report first.
Through the seat or the floor. That points at the rear. There is no steering connection to carry it forward, so it arrives as the whole vehicle shaking rather than the wheel in your hands.
Both. Either more than one assembly, or something that is not balance at all.
That one observation can halve the work, because it says which end to look at before anything comes off. It is worth paying attention to on the drive in rather than trying to recall it at the counter.
The other half of the description
At what speed. A balance problem lives in a range and fades either side of it; the speed it appears at is useful information in itself.
Whether it is new or gradual. Sudden usually means something changed, like a lost weight. Gradual usually means wear.
Whether anything was done to the wheels recently, including a tire repair somewhere else.
The national tire and wheel balancing page covers the occasions worth asking for balancing in the first place.
When it is not balance
A vibration at every speed, or one with a pull alongside it, is alignment or something worn. A vibration that survives a balance is usually the rim, and wheel refurbishing is at this store.
All of those are handled here, so the question can be worked through rather than guessed at.
About this store
The Mabelvale store carries all nine Purcell tire categories and is managed by Corey Germany.
See the national tire and wheel balancing page for all 51 locations.