Ukulele

I am going to learn how to play the ukulele during this summer. Or atleast by the end of this year. And by that I doesn't mean that I should be able to play like a professional but I should be able to play a simple song without any trouble. How hard can it be? I have given up on trying to learn to play the guitar but a ukulele is smaller, works fine with my small hands, and it only has 4 strings so there is not as much to learn. Some people sound a bit skeptical when I say I've never played the ukulele before. But I will never learn anything new if I never try, right? And you never learn if you never make mistakes so I say it again, how hard can it be?