So you want to find a restorer. A good restorer.
The best way to do this is to ask a museum near you. Period.
First of all - there are not a lot of restorers. They don't have enormous advertising budgets, or luxury-rental studios. A good word-of-mouth reputation is their best billboard.
On the other hand - museums will know the ones who work commercially or in-house (and take on work in their ha-ha, spare time). They have a little list - really...and they have standards.
So call a local museum and ask for the conservation department. If they don't have a conservation department ask for the curator of the collection. Ask if they have any names of people who can repair/restore/conserve - whatever you have.
Some china halls, jewellery stores, or silver plating studios will quite often offer a repair service. It could save you the leg-work of visiting the restorer yourself, because they do it. Restorers might have odd locations or hours - especially ones who work in a museum part-time; but stores have to stay open. Bear in mind that you'll be paying a lot more for their 'middleman fees' and you might have to wait a long time for the estimates or work. A store would have to collect enough jobs to make the trips back and forth viable and an extra person to do it.You also won't be able to talk to the restorer directly about what kind of repair is possible or what your expectations are.