Border Collies are sheep herding dogs. Their balance point is the perfect distance from the herd of sheep. Too close, and the sheep will scatter. Too far, and the sheep won't move. When a Border Collie finds its balance point, the sheep move (as one) exactly where the dog directs them.
As the Sun transits through Libra, it will square Pluto at 9 degrees Capricorn (September 29th to October 1st) and oppose Uranus at 10 degrees Aries (September 30th to October 3rd).
You may have had a taste with transiting Venus in Libra. Events (with this upcoming transit) may be similar to the Venus transit, or a continuation. Having said this, the transiting Sun is a general influence; it's not about love, or money, or sex, or communication. It's just energy.
What this influence will do is illuminate the following issues: fairness, balance, partnership (not just romantic), projection, the needs of other people. Remember that Pluto digs underneath to get to the shadow/hidden issues, and Uranus clarifies everything with unmistakable truth (which can present as a shock). The net result will be change, and the challenge for Libra will be to navigate that change without swinging to crazy extremes.
Easier said than done. It's tempting to flail over here, and when that doesn't work, dart over there and see if that gives you the desired result. Sometimes it's good to explore extremes. But in Libra season, the task is to find the middle ground. Uranus and Pluto will make it very tempting to throw up your hands and say "Everything's off balance so I might as well just tip the whole relationship/situation over." Libra can rival Scorpio in the all-or-nothing stakes.
Sometimes you have to knock the dishes off the table. I'm not going to advise anyone to repress or deny. But always keep your balance point in mind. It's your sweet spot (same as the Border Collie) where just the right amount of effort makes things move.
If you have planets/angles (natal or progressed) from 8-11 degrees Libra, Capricorn, Cancer or Aries, you'll feel this transit most strongly.