Alt of people advertise in craigslist about your situation. Make a post letting licensed people know that you have a tree in the backyard you need removed for free and that they can cut it down for free firewood. You'll get plenty of responses. Just make sure the person is licensed and insured.
First I would ask some people you know (neighbors, coworkers, church members) if they can recommend anyone. Second I would check your Yellow Pages for someone who knows how to do this. Don't let an inexperienced person attempt this if it is a large tree as you say. Serious damage can be done if the process is not handeled correctly by someone who knows what they are doing. Bonus if they have a company because then they have insurance in case they drop the tree on your house, a power line or a jay walker.
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