Pluto can be a bit tricky, because it is quite faint. I think the biggest help in finding it is a good star chart. I use Sky Safari and zoom right into the star field around Pluto, and match that to what I see in the eyepiece.
I can't find it in my 12" when the moon is around, but it stands out in dark skies. It's currently just over magnitude 14, so might need a 10" minimum to see it at a dark site.
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