Same thing I did, learn by trial and error. Fortunately, my LHBS at the time was the Oak Barrel in Bezerkly and the error rate was low.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk