Im teaching a friend of mine guitar, but he always replied , can you teach me a song titled this or that. I always replied yes, but you should learn a few basic chords. C, D, E, F, G, Am and so forth. Well he got frustrated and went to someone else that did teach him a song. Well that was about three months ago, and to this day, he tells me he wished he had took my advice. You can learn a song , but not knowing chords is the difference between swimming , or just floating. If you can,t get a teacher, go to your local music store, most of them have the books that have a DVD or CD, so you can watch and learn, or listen and follow the diagrams. .....Good luck....Practice , Practice ,Practice