After a day with a manual pole saw, your in for a whole heap of pain you probably havent felt before. Your neck muscles alone will be new found areas of hurt.
A climber will be able to get around that tree, cut the dead free, then unhook it when it gets stuck a little further down in the tree (as it always does), do better cuts, and walk away uncrippled in 1/4 of the time you will take. He wont bend his pole, get it very stuck or end up with a limb across his face either. I doubt your going to be able to beat them on price or safety.
Even if you get the job, its going to hurt ya doing it in the way your describing!