wish i had pictures of the one i got to go backward. just a matter of cutting enough weight out to shift the center of gravity in your favor and setting a pull line.
i was taught to do them them the same as a straight tree just stay on the upper side so your not fighting gravity.and plunge cut when there is a risk of barber chair.that is unless your talking about a tree that's leaning because its starting to uproot.
do a search, should find plenty no how to bid. also do you have the experience, capital, and skills required to run this type of business? and this is probably the wrong forum for this thread.