I hadn't got a full clue on the trine and square business, but the transit is changing signs and the opposition means a planet opposes another. To forecast my personal year is analysis of natal star chart planet positions and combine those with this year's planetary movements...and next year's (January 2013) to determine where my life is headed to: trine, square or whatever.
Looking at the planets, Uranus is in Pisces or Aries: square my natal Uranus in Scorpio. Meanwhile, I had a Saturn return now entering Libra, and Venus in Pisces (or Aquarius) so it's trine my natal venus in Aries. In the next year, Venus completes its year by reappearing in Aries and Mercury is found again in Aquarius by years' end, so I see a quickening and brighter visions of life.
Then there's the current Mars meets natal Mars in Virgo and natal Neptune in Sagitarius is in Pisces, another ruling sign...and Mercury quickly jets into Aquarius not far from the natal spot in Pisces. I predict a life-changing moment when it comes to career and relocation, with developing a romantic partnership...and currently, Pluto is in Sagitarius but two signs ahead of Libra or my natal Pluto spot.
The Jupiterian-Taurean combination indicates this year will be rough, but a "back to basics" attitude on concerns with money, income and prosperity. Next year, Jupiter in Gemini and Saturn in Scorpio are warning signs of a possible financial disaster and my need to be prudient to hold onto my wallets in sticking close to a tighter budget until things on finances finally improve. And Mars shows up once more in Aquarius, an indicator of a hard working but dedication to achievement of my life goals.