I did one like that a couple years ago. Luckily, it had a tall cypress growing right next to it that I tied into. I attacked it from the top down. Still took over two hours to clean all the boots off. Almost filled the chip truck, too. Charged $300, shoulda been more.
Since you probably don't have another tree nearby to tie into, you'll have to just start at the bottom and work your way up. Do as much as possible off the ladder, then spike the rest. I always use two tie-ins when working tall palms. A climbing line snugged up tight around the trunk and a lanyard on my side D-rings. If its a small diameter, I'll sometimes wrap the lanyard once for extra security.
The friction saver with a prussic(Page 15 in the Sherrill catalog) looks like it would work well on palms, and you wouldn't have to tie into the head. I never liked doing that.
Good luck. I hope you charge extra for those. Like Brian said, NAAAASSSTEE. You forgot to mention the bull ants, you know the ones with the giant jaws. When you try to pull the off, they hold on so tight their head pops off. Yuck.