Sentence:  Because of his brain injury and the extreme damage suffered to his sight , the patient had to <WSD>train</WSD> himself for a new line of work , that of a portfolio maker , an occupation requiring a great deal of precision in the making of measurements and a fairly well developed sense of form and contour . 
Meaning of the word marked with <WSD> tags:  undergo training or instruction in preparation for a particular role, function, or profession