I'm a 15-year-old guy with no experience in playing musical instruments or in reading music, although I've wanted to learn one for a long time. I'm really into western classical music, especially piano and violin solo pieces. I'm also a huge metal fan, especially of extreme/neoclassical metal (think Cradle of Filth, or Ne Obliviscaris).
Now, I'm planning to learn an instrument. I'm not sure what would suit me better - a piano/keyboard or a guitar. I'd want to attain at least an intermediate level of proficiency in the instrument I learn in 3.5 to 4 years, with around eight to ten hours of practice a week, and 3 hours a day for all of next month (Christmas holidays!)
I'm OK with focusing on only classical/theory stuff if it would help me achieve my goals - i.e. I don't want to learn every popular song on the charts to impress people.
I believe I do have some compositional ability, and maybe learning piano would help make it easier to explore that. On the other hand, the portability of a guitar is a huge advantage for me.
If you want to know what my 'goals' are, they would be something like being able to play Chopin's Marche Funèbre or the first movement of Moonlight Sonata on the piano, and maybe the lead guitar part of Iron Maiden's Hallowed Be Thy Name on the guitar (although I'm aware that these goals may be a bit unrealistic :D) in three to four years.
What would you recommend?
(Also, another question: roughly how much experience does it take to play the guitar solo starting at 8:28 from this song?