Not to steal Moss's suggestion, but to expand a little; here's a discussion on the Forestry Forum which might be helpful. (I like the idea of using a pickup or tractor instead of a winch, although you should have 2 people; one to pull, the other to spot.)
http://www.forestryforum.com/board/index.php?topic=18395.0
http://www.forestryforum.com/board/index.php?topic=18395.0