Driver training cars often have prominent "student driver" signs on…

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Driver training cars often have prominent "student driver" signs on them. This serves warning to other drivers to give the new driver wider than normal margins for error.

I wonder how we could give similar warnings in other areas of life? Sometimes, when trying out a new skill, or new persona, we may bump into others, causing them pain. It would be handy if there were socially accepted ways of offering such warnings in dating, work, etc.