Sometimes I think that people get a little overbearing when they start saying that if all you want to do is three chord songs, then that is great, but if you want to get better, you gotta........... You know, if you learn to play just one more chord, you are playing four chord songs, and when you get right down to it, all you have to know is ten chords to play a ten chord song. So going beyond a two or three chord song does not make one a virtuoso. That said, I play a lot of songs with more than three chords, but one of my favorites has only two. As far as confidence, what is there to not be confident about? You are learning to play a ukulele. Sure it takes a little work, but what the heck, it is just a ukulele. You can learn to play it. Don't take it so seriously. One last thing, then I'll shut up. Whenever I practice, I end my session by playing the song that I play best. And I sing along with it. That reminds me why I'm playing the ukulele in the first place, and I always end up on a positive note.