They actually make a specific tool for this purpose. They are available for rent at most tool rental places, home depot, and lowe's for about 20-30/day. They are called EXTENSION LADDERS. Seriously, when dealing with heights, get the right tool for the job. It's a matter of safety. Depending on the exact job, you might want to rent a scissor lift or a bucket lift. Any other way involves advanced rope access work.
