I used this Company to help identify a travel agent that specialized in the area I wanted to visit.
https://www.zicasso.com/
Zicasso did not plan the trip itself, but did locate an outfit that did. We used them for two separate trips, two week each. The first was a trip to Germany (mostly southern Germany, including Salzburg) and the second was a trip in France that started in Normandy and included stops in Paris, the Loire Valley, Provence and ended in Nice. They were both trips of a lifetime and trips I use as a benchmark.
There is no obligation, but it might be a useful alternative as the sources they suggest are experts in the locale you are interested in. We had private guides where they suggested and a detailed itinerary for each day with options of things to do and recommendations for where to eat.