A few comments based on my experience;

Know your family history, PC does run in families.
Consider your age and general health with respect to any actions taken as a result of a high PSA score.
Pay attention to anything that could be symptomatic.
PSA is best looked at as a datapoint needing further investigation.

In November of last year I had routine bloodwork done. My GP suggested a PSA since I hadn't done it in years.
It came back a bit high (5.7) so he suggested we wait a few weeks, that I stay off the bike, and we'd repeat with a look at both total and free PSA. I of course had no symptoms.
The test came back with the same total count but the ratio of free to bound PSA was in a range only encountered when cancer is present. That convinced him to send me to a Urologist for further consultation.
The Urologist did a DRE and simply told me I needed a biopsy and explained why. The biopsy returned with positive results, 8 out of 12 cores cancerous, Gleason 7+.
The day after the biopsy I was in the hospital with septicemia from the biopsy, a nice fever racked 4 day visit. So no, you don't a casual meeting with a biopsy needle.
A few weeks later, back to the Urologist for a "what now" chat. He explained the situation, the possible treatments and the possible outcomes.
I told him I'd take 3 months to visit and consult with a radiation Oncologist, a DaVinci surgeon, witch doctors, the whole bit. I'd read up on treatments (or lack thereof) and be back in three months for yet another PSA. If it had gone up, I'd pick a course of treatment and go.
The 3 months lapsed, we did a third PSA with the obvious result, higher of course with velocity increasing. I elected DaVinci robotic surgery after even the Radiation Oncologist told me to consider nothing else. The reasoning being, at my age (59) and general condition (rail thin, 1000 mi./month cyclist) I'd recover from the surgery quickly, and the likelyhood of getting all the cancer was very high.
I had the surgery with the pathology report showing no evidence the cancer had spread beyond the prostate. My surgeon was smiling when he told me that, it really made my day.
I recovered quickly (walking the next morning, back on the bike in 5 weeks) and now have a 0 PSA score and here's hoping it stays there.

Here's the bit about family history, a week after the surgery my uncle (mom's bro) called having just heard from my mother about my little adventure.
He said, he'd had the same operation a few years earlier, and that his brother (another uncle) has PC and my grandfather had it when he died.
So moral of the story? PSA testing in my case raised a flag and paying attention to that flag did add years to my life, Gleason 7 is aggressive. I'm glad I paid attention to it, I'm glad my GP suggested it.