I know nothing about what you have to do, but you may be suprised at how quickly the regular old handsaw works. I want a pole saw something fierce but the reality is for us, for the amount that we do, I just knock it out with an old style wood one with extensions, somebody "borrowed" my good fiberglass one and has not returned it....
If you do go for a polesaw. They range between $200 for a Poulan pro / Ryobi / cheap type brand to around $500 for a good Echo / Stihl / etc quality brand.
Still not sure which way I will go if I decide to get one. The cutting head accessory to go on my commercial Tanaka trimmer is $200 just for the cutting head.