Both ع and ح are pharyngeal/throat consonants. The book differentiates ʿayn by jahr and intermediate flow, versus ḥāʾ by hams and free flow.
Read عَ، حَ slowly and separately. Merely making ḥāʾ louder will not turn it into ʿayn; their articulations and acoustic qualities need to remain distinct.
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ʿAyn versus ḥāʾ
Letter-by-Letter Qualities and Distinguishing Features
Both ع and ح are pharyngeal/throat consonants. The book differentiates ʿayn by jahr and intermediate flow, versus ḥāʾ by hams and free flow.
Read عَ، حَ slowly and separately. Merely making ḥāʾ louder will not turn it into ʿayn; their articulations and acoustic qualities need to remain distinct.