Forum Moderators: not2easy
Check past work samples and, if possible, references. The fact that one student turned out to be unreliable doesn't mean that every student will be that way (though you can expect conflicting priorities and, in some cases, limited work experience).
also check with PR agencies. If they can't or won't do the project, they probably know some decent writers.
Also, many times writers (meaning people who consider themselves authors) support themselves by doing freelance copywrighting.
....just like musicians give lessons...a necessary evil to some.