It's harder for family and friends to offer solid advice because often they're using their experiences from heterosexual relationships etc.
And yet much of the good advice I get comes from observing the experiences of the het world.
While I believe gays do have some unique relationship issues, I also believe the vast majority of these issues are fundamentally similar in both the gay and straight worlds. Therefore my first step in solving a gay relationship issue, for myself or for others, is to look for parallels in the straight world.
I strongly believe that humans are humans, and men are men. By that I mean we're all very much alike, gay & straight. Sure, I seek male romance rather than female, but romance is romance.
Certain male behaviors are nearly universal. Think your BF isn't treating you well? You'll find straight men who treat their GFs exactly the same way, and some of the solutions are also identical. For almost every relationship complaint I read here in these threads I have seen the same thing between het couples, and they're also often handled the same way.
Therefore I DO think family & friends can offer solid advice, provided they too can recognize the commonalities, and not get sidetracked by the orientation issue, like you're a different species or something. In the absence of that, just look around you for yourself.
Nobody ever really taught me, either. I had to learn by observation and trial-and-error. And as for being "cut out for being gay", Nature's already taken care of that, my dear. And if WE aren't cut out for it, then I don't know who the Hell is!