They won't perch. They will sit in your hand or you can hold them, but they prefer (as most birds) to have their feet supported or against something. That also means they can use that to launch themselves, so you have to be careful.
I've been able to tame them with mealworms. Just find out what they like and it shouldn't be a problem to get them to come to you. Eventually, you can use a word as you give them the treat and they will associate the word with the treat.
They aren't the brightest birds though. I prefer to say they are "more instinctual"...haha! Being around them goes a long way.
I think my coturnix are pretty tame, but then someone else will come into the bird room and I realize that they are just used to me and aren't afraid of me, specifically. I have budgies and a lovebird in the same room so I'm in there a lot playing and talking with the cage birds. I also service all the cages everyday so I'm around a lot.
Just like any bird, time and patience will go a long way. Each bird's personality also plays a role. Some will never get tame just because of their personality. Sometimes you get a really special bird. That's the kind that's dangerous because they make you get more!