Once you narrow down your choices to the individual(s) you wish to hire, call them and offer them the position, Set up a tie when you give them more details about the job, review the job requirements, arrange a time and day for the to start, and have them fill out a Contract Agreement if you desire to formalize the arrangement. You can hire the personal assistant on a trial basis (for example, three months probationary then review continued employment cased on your assessment of job performance.