Good advise, there are also many quality vid's on YT put up by all the major manufacturer's on how to properly judge the situation before you even attempt at cutting and how to operate it safely once you do. There are also "chain-saw fail" compilations and 75% of them have homeowners up really high on ladders only to have the limb they just cut swoop down and send them flying. Just got this present from Irma down on the deck safely today,
https://i.imgur.com/LwivLub.jpg talk about a dicey situation!. Called in a Pro for an estimate and he quoted me $5,250, he then added, "oh, this is usually $6-7K all day long, I'm not making a dime here, I'm just very concerned about your safety". Guess I would be safe, my wallet, not so much, I sent his as$ packing and bought a bigger chain-saw.