Re: Luck or skill?
You can't know without looking at hands (not necessarily every hand but, for example, every 25th hand or the biggest pots you won/lost or whatever) and seeing what ranges you put your opponents on and whether that range a) justified your actions and b) was accurate. And even then you just have a general idea.
In my view, poker is far too complicated for tools like pokergrader to be useful.
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