Thank you very much for the info and for going through the trouble of making pictures of every step, tahra!! I'll be trying this as soon as possible.
Actually for kids it's enough to just hold the body firmly and twist the head to one side while pulling at the same time. The head pops out quite easily without any damage.
For the legs, I hold them at a 65° angle and put my thumb in the gap where the backside is supposed to be. Then I kind of push the leg-piece out like that, twisting it to one side while holding the body in place.
When the legs are gone, the inside frame can be pulled out with ease and the arms fall out when doing so.
A few simple clicks put them back together and they're not harmed in any way.