Ah, I'll write with Arthur.
So... Apparation. He learned that skill while he was at Hogwarts. During one of his later years, the Ministry sent an official with the task of educating all students how to apparate. That is how he learned it.
Occlumency and Legilimency... also while he was in Hgowarts. He was pretty secretive about lots of things, which automatically needed a defense mechanism. Using many books, practicing with his one friend he he had, and a little with professor Flitwick, he managed to learn both of these while he was in Hogwarts.
Non-verbal.... practiced on his fourth, mastered on his seventh year. Practiced with professor Flitwick while he was on his 4th year, he managed to master it until the 7th year, which is why he outdid all of his peers and had not problems passing the exams.
Wandless.... started practicing with professor Flitwick on his 7th year and the continued alone using several books and reading a lot of related literature. He practiced it while he was working in the school, and later when he returned home to be with his sister. He managed to master it there.
Good enough?