I have a few planets retrograde, including Merc, and have been trying to get a handle on how the "Retrograde-state" compares to that of Direct. When looking at the manifestations of the permanently, constant, Retrograde-state of the sidereal Ages through the millennia, I noticed that they aren't as starkly obvious as those of the Direct-motion tropical Ages.
Now I see that the word "Direct" is the key to understanding the term "Retrograde" as meaning the opposite term, "Indirect". Instead of going directly from A to B using the shortest, most direct route possible, Retro is about meandering, and using a series of approximations prior to reaching the most correct version of the desired goal.
So, rx Saturn is more subtle than frontal-assault Saturn direct, but still the same old Grim Reaper.
I have a few older pamphlet books by Helen Adams Garrett that I haven't yet sold and retained. One is called "More About Retrogrades"....and she maintains a German astrology position of the Uranian School, that Retros in our natal charts (at least), are indicative of being markers of where we need to "repeat" past life experiences we didn't hone OR we are attempting in this lifetime to make more perfect.
See it here:
http://www.astroamerica.com/retro.html
and:
https://www.ebay.com/i/380583102074?chn=ps
It likely doesn't come easy either. - but can give us clues as to (the aspects,etc) what/how and in what manner we might attempt working on the energies.
From (vague recollection) Mercury rx, tends to go to the past too much and can get stuck reminiscing this way.
As I look at her book again and reacquaint myself, I might add a few tidbits for consideration.
Mercury: Approx. every 4th month usually 3 times per year for 20-24 days Mercury will retrograde. Every 6th yr. the retro station is made 4 times.
I have: Saturn rx, Uranus rx & Pluto rx and "issues" will all 3
She mentioned on pg. 7, "John McCormick in "The Book on Retrogrades" dealt primarily in the #s of them in a natal chart - saying certain expressions of energy seem to apply to each given number of planets rx.
He suggested the following in that book:
None: - Expend enormous physical effort ( *with all Direct planets)
Two : - Depends on Public sentiment
Three: Determined to excel
Four: Seeks expression in private
Five: Solitary occupation.
(I have 3 of them) My middle daughter has 2 RETROs (Venus in AQ, and her Sun ruler Capricorn's Saturn in Fall 0 Cancer), She always gets the shaft in her few relationships, ALWAYS with deadbeats she is attracted to what she considered to be "victims in life" I told her with the last one, "Jen, you brought home one of your clients"from her social work she does; and she laughed, admitted to me it was true. He stayed for 15 years, was just there as a gigilo I'd say (and my husband agrees)...and finally got (as his own brother once said that about him ) half the house, quite literally! Otherwise, she's extremely bright.
She is currently looking at another "victim of society" to help....We are currently (partially) estranged, but she sent me a card today.