I've had a few WGs put the condom on with their mouth. Interesting and does achieve a nice "fit".
A few can get it right with their hands but most don't have a sodding clue. I've had some try and put it on inside out (upside down) and get confused as to why it won't roll. Many, many, many stick their fingers into the condom and stretch it over the head of the cock then pull it tight down to the base. Bloody painful as well as being functionally wrong as described by others.
As soon as the condom comes out now I watch for what "mode" is being used and take charge of it if I need to. Some girls get in a panic at this, thinking there's some subterfuge taking place with it being palmed rather than put on but as long as they see it going on they are then OK.