I'm in a lesbian relationship now since August of 2013. I don't really know what to talk about with this, it's a weird thing. It's been very bumpy at times due to physical limitations, but I am trying to be more open about it. I guess I have to say that I like keeping my relationship between me and the person I am with as much as possible. No one in my family nor my friends in real life know about it.
What is it like? When it's all going good, amazing. I feel really happy, even though some other things usually bring me down at the same time. I like being with them, it makes me feel safe, I need someone to hug, kiss, open up and expose myself to. I would say the biggest part of a relationship is trust, in yourself, and in the significant other. To open your heart to a row of knives and a row of blankets, it's nice to get the row of blankets from someone. It's nice to show them you. No matter how broken you feel. For them to take that and to make you feel secure and safe, and to do the same for them.
Now for how you get into one.. I don't know. My first real "relationship" started off as a rather weird crush. It ended pretty badly. The second one resulted from me being raped and seeking protection, the protector had become my boyfriend later. And this one, current one, resulted as I left the last one in anger and sadness, finding happiness and love in someone else after we got to talking a lot.
I really don't know how you get to find "the one". For me it's just been a lot of talking. Getting closer and closer and eventually making the step to tell them you'd like to share more of your world with them, and hope they want to do the same. It's not quite an escalated relationship at this point, it's close, though. Then you spend a few days or weeks like that, and then you can say "I love you" without feeling awkward. And they will say "I love you, too".