I mean the velcro-strap type ones.
It was suggested to me today that ds (2.2) should really be able to do both, and at least be expected to take them off himself. He can actually get them off very easily when he wants to (usually in the car ) but is strangely resistant to doing it when we get home from being out. He just says 'You do it please Mummy!' and no amount of encouraging can get him to do it himself.
He doesn't seem able to put them ON himself. He is pretty good at fiddly toys and puzzles, though, which makes me think maybe he just doesn't want to.