Despite the general opinion from many conservatories and teachers, there's nothing that proves that you can't learn piano and reach a considerable good level. read more
One can be really good at the piano if one is really into it or practices enough. It would also help if one has an experienced teacher but it would be much easier if one were to be introduced to the piano at a younger age. read more
Try to practice two or three scales before each session. Do this whether a "session" is a lesson with a teacher, or some free time slot you assigned to learning and practicing the piano. Try to practice using sheet music that contains finger numbering on them, especially at first. This way you can be sure that you are playing correctly. read more
If you can practice 30 minutes a day, or at least 2-3 hours a week, you should be able to learn the 3 songs in less than a year. The thing is how long it takes to learn to play popular songs on piano as an adult isn't really quantifiable. It really boils down to how much you want to play it, and how fast you learn. read more