Homemade apple juice?

I have seen a lot of "just use a juicer" answers on here and all over the net. I don't know if i got the wrong kind of apples or what, but I juiced them and it was really tart. So I added some water. It's diluted enough, but still tart, so I added a little sugar. Still tart. Should I add some more sugar and try again, or what?