10:12a We do not dare to classify or compare ourselves with some who commend themselves.

For we (excl.) would not risk classifying/ranking ourselves or compare ourselves with some people who recommend themselves ⌊as qualified⌋ ⌊to be your leaders⌋.
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Some people praise themselves ⌊about how important they are⌋. Should we be bold enough to say we are the same kind of person or compare ourselves to them? ⌊No way!⌋
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⌊Some people wrongly think that⌋ we would be too bold to say that we have the same status or are the same kind of person as those who proclaim how great/important they are.

10:12b When they measure themselves by themselves

But when they measure themselves by one another (Revised Standard Version)
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Those ⌊who proclaim how great/important they are⌋ say that their colleagues/friends behavior is good and then judge themselves by it

10:12c and compare themselves with themselves, they show their ignorance.

and compare themselves with one another, they are without understanding. (Revised Standard Version)
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and look at the lives of their colleagues/friends and say about themselves that they are the same as them ⌊and therefore good/right/proper⌋. This shows that they do not have good sense.

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