[james-skemp]

You have a couple options, as I see it (there could be more):

Find someone who's had to deal with something similar to find out who they used and their experience.

Contact a state or local bar association. In Wisconsin our state bar has a lawyer referral program. They're not necessarily the best in their field, but they're a good start, and a limited consult might be free or of little cost.

[Luc]

Thanks. I just checked the website of my local bar association, and they have a search form with about a dozen specialities. That doesn't narrow it down a lot, but it's a start.

[james-skemp]

They might have a number to call.

Our online form had basic functionality like that, but calling let you talk to a staff member who could help you clarify what you might actually need.

(I worked as a web developer for a number if years there, and the form didn't get updated much while I was there.)