Best tip I can give: Be open with it.

If someone talks to you and you're not sure who they are, tell them you're faceblind and ask. It takes some getting used to, but it's worth it.

In my previous company we gave a short introduction when joining, and I included faceblindness. "If I meet you randomly on the street and don't say hello, that's not with malicious intent."

Most people are understanding, though a few are not, but really then it's their problem.