https://www.digipulse.io/ is a crypto will but it is NOT fully decentralized, it relies on a server sending emails to your trusted parties and some form of online lawyers managing the transition of DIGITAL assets not only crypto. So mostly for digital asset (social accounts, cloud storage etc) transition, NOT crypto it could be worth it. In other cases no difference from lawyers, hopefully better UX.

https://safehaven.io/ is another such service, the only thing it does it frezez your funds in an account and divides the private key between your chosen heirs + their validator )) very funny IMHO ) you give their validator the power to blackmail your heirs because without his part of the private key they cannot cooperate to unlock the money.

All of the traditional lawyer/will proposals are obviously involving a HUMAN whom you dont know and who has the power to decide what to do with  your will, so I would be cautious with the info you provide.
In case you still are choosing this path most rationally would be to pay the lawyer a small amount upfront and the larger amount upon the completion of his part of the deal (include a payment for him in the testament that can be done from your account only by your heirs).