I was well familiar with the downtown area from my first visit. In fact, I knew exactly where the main train station was located and the beautiful walk along the river that highlighted some of the best architecture Zurich had to offer.
The only thing that perplexed me was figuring out where to purchase tickets and where to catch the trains at the right time. The main station is HUGE and it seemed like most trains headed to the Flughafen (airport) with added stops to different places on different trains. This kind of took me by surprise because I didn't know which train was the better option.
At any rate, I ended up taking the right trains that got me to my destinations (to and from the airport) in 10 minutes rather than other options that would have taken up to an hour.