sadly, astrology was not offered in social work school. so i don't know much about it (deborah singletary does, though, and you should check her out at vision carriers and say that i sent you). the one thing i do know is that when mercury goes retrograde, it is important to be vigilant about communication and transportation and signing documents. things like that.
here is a link to something about mercury in retrograde from the twins at astrostyle.