I use the highly scientific method of setting the drag in the approximate middle of the range. I pull on the line and if it seems hard to pull, but I can pull some, I say "yup, that's about right." Then if I catch a fish I adjust it on an as needed basis. It the line is going out faster than I can reel it in, then I increase the drag. It the line feels like it's getting so tight that it's going to snap and take my eye out, then I loosen it up.

Is there any other way to set drag?

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)