Music from the heavens, a glorious light shining on a particular set of four letters, and a mysterious slap on the face that says "this is your type, keep it!"
Okay, it's not quite that, but there was sort of a turning point moment in my case. A moment of almost falling out of my chair with "this has been my type all along hasn't it???" An excitement followed quickly by boredom, because I had a sense that even though I'll probably still be questioning this for the next year or so that part of me is not going to be torn away so easily. Darn self concepts can be so clingy.... On my initial type there was also a sense of excitement but it wasn't quite the same sort and could be just through having this whole new theoretical toy to play with and had some capacity to "get" me.
So pretty much you'll have a sense that you know it's right when you try on all the types likes shoes, checking them out for all that they are, and one of them not only fits (makes sense for your foot) but you can't wait to check them out and wear them whenever you have the opportunity.
Will you ever really know that you're right? Okay maybe not 100% but this isn't an exact science. Just trying to be hopeful