Doing the work required to have an opinion

As Rabbi Moses ben Maimon (1135–1204), commonly known as Maimonides, said: “Teach thy tongue to say I do not know, and thou shalt progress.” I have previously written about many of our biases when it comes to watches, and thought I’d share another take on the matter. Many of us hold an opinion on watches and watch collecting, but how many put in the relevant work required in order to have this opinion?