Sorry, but if you are unable to hold a baby and fold up something you can do with one foot I feel for you..
I have brought up 2 children, and not only is this not hard, it is easy.
Not like I get the bus, but when my kids was babys, if someone with a wheelchair came on, I would straight away fold the pushchair up and give him room.
If the baby woke up? You put it back to sleep. I swear people here making our parenting is hard have never had kids and just been told by there mummys it was hard.
*EDIT* before you call me out with the one foot. You place your foot under the catch at the bottom/middle of the pushchair, give it a quick lift to unlock it, then take your foot on the back of the pushchair and push it and it folds. OMG SO HARD FU DISABLED MAN