This is usually done a little while after leaf drop (first couple of frosts). Search the forum using the word "winterization" and there are some good methods. You have it right sofar. I personally would use straw instead of leaves, but some say potatoe some say potato.. I would also gently tie up your branches.

I personally would not top the tree.. Some on the forum have had good luck with digingg along a side of the tree and laying it down and covering it with straw then a light colored tarp I believe.. Then in the sping they uncover it and place it upright.