Human doesn't know limits. You can learn as much as you feel confidential and capable of. And due your willingness you must involve patience and "Can do" and "Never give up" spirit.
-Set up goals and keep your eyes on the prize and never look back.
-Do not become disappointed
-Do not become tired
-Do not stop trying
-Repeat, repeat and repeat
-Practice, practice and practice
-Be positive, be yourself and believe in yourself.
Then, not just two, but you can learn several skills on different categories.