:) Its very easy when you are stuck on a hill cos you pull them over the top then roll back a teeny bit. Same principle when not on a hill but you might need to clear a bit of snow from under the wheel to give yourself some roll room.
You must take them off as soon as you hit tarmac as tarmac shreds them really quickly. Ours got a little bit holey but still worked really effectively.
Also, have just ordered another pair of yaktrax for dd. We had some for ourselves and they were splendid. I could literally dance on sheet ice. Very expensive but I figured it was better than a broken arm.