I think the route you are taking is a good one by visiting the pro shop and letting them look at your style to suggest a ball. Taking your old ball can help them too just keep in mind the new ball may differ from the old but not a deal breaker, just gives them as platform to see and start from.
One thing I have noticed in regards to pro shops hours, they are usually open in the evenings and weekends. For me trying to get one open during business hours was impossible so I mention this based on your having to travel for an appointment and I am assuming this is a daytime appointment, that you check with the shop prior to leaving so you can avoid it being closed during your visit. If you have this covered then disregard it.
GL!
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