The phrase "assessed himself" is correct and usable in written English.
It can be used when someone is evaluating or analyzing their own abilities, performance, or situation.
Example: "After the project was completed, he took some time to assess himself and identify areas for improvement."
Alternatives: "evaluated himself" or "self-evaluated".
Finally, respondent assessed himself in comparison with sibling now.
In the president's comments, he analyzed the defensive play of the Georgetown guards, narrated a replay, and assessed himself as a player over tape of his 2008 campaign scrimmage (part of CBS's permanent digital archive) with the North Carolina team.
Teacher Fei assessed himself through the girls' eyes: bored and boring, no doubt undesirable in any sense, but who could guarantee the girls that the flirtatious young man online who made their hearts speed was not being impersonated by an equally disgraceful old man?
… Brandt Snedeker assessed himself a one-shot penalty on No. 13 when his ball moved after he took a practice swing.
He is always assessing himself, always trying to improve.
Thomas was asked Tuesday to assess himself — and whether as general manager, he would keep himself as coach.
And keep assessing himself by his standards, not anyone else's.
David, whose blond hair, face-crinkling smile, Southwestern twang and slump-shouldered build are jarring reminders of the Mick, is pointed in assessing himself.
Mr. Sondheim, who comes across in both books as remarkably clear-eyed in assessing himself, makes a telling observation about the evolution of his writing under the influence of Mr. Lapine.
"Tony will come and do all the pre-season, play in the matches and assess himself and hopefully he'll be ok to do another year.
Edgar Allan Poe, assessing himself, said: "Men have called me mad; but the question is not yet settled, whether madness is or is not the loftiest intelligence".
