Hi friends, 
I'm going to talk about something I have always wanted to learn to do. Particularly, I would like to learn to play the flute (western concert one). I feel like to learn this instrument because it appears in songs I like such as "Down Under" or "Canon in D" , as well as I may play it wherever I'd like (if it's possible) due it doesn't need power connection as electrical piano and it has a good melody. 
I think the measurements of difficulty for playing this instrument are not easy at all, because it needs long time for practising and its techniques for achieving a good sound are so many ones. However, I still have the dreamy day (though it could be in a thousand of years later hahaha) I see myself playing it. 
The process of learning to playing the flute must last at least 3 years, because it requires to learn about music theory for reading and performing scores besides of decisive factors I've told above such as dedication and time.
Though I bought a flute earlier three years ago by saving up money during many months and I learnt a little of fingering (by pictures) in that year, I would really need as equipment a proper teacher or interactive tutorials to enhance the sound by blowing, because it remains as the highest difficulty I probably would face during the whole learning. 
I wish to learn it during the next summer holidays when there's a lot of spare time.