Off topic kinda, you might be able to make some money on that cedar... A guy where I live pays real good money for it... It probably has to be atleast 26ft though, I'd definitely look into it.
Here are some suggestions.
Try to find someone locally that could be a mentor. Do not try to do it with someone on the ground that has no clue what they are doing, or without anyone on the ground.
Do not cut towards yourself, one handed or with an angled back cut, or above your head. Do think what will/could happen after you make the cut, to the wood, the saw, and to you most importantly. Do tie in twice. I like to use a break cut if I'm piecing it down close to stuff. Keeps both hands on the saw, wont pinch on you, easy to control the wood when breaking it off and while cutting.
Also I doubt you hit 80ft because then you'd be tied in with 150ft rope and be at the end of it at 75... Also rope usually comes in 120, 150 sections, so since you're just starting out I'd guess you got 120ft...
Above all, stay safe.