Ok, poney up the money and just get a hank of Arborplex. 120' should be around $70, cheap enough and easy to learn with. When/if you hack it up, it was a cheap lesson to learn.
I did a few pines without a wire core, I bought one quick like! It was an uneasy feeling. I even did a small one without a lifeline, bad idea.
You are getting bashed because you think you are too smart, that is what is going to get you hurt. You have little time with a saw on the ground and now want to do TD's? You need to work on the basics on the ground a bit first. Learn making face cuts properly, learn how to do a "snap cut" and a "jump cut" and what effects they have and why. Learn the physics, ASK yourself "What happens when I do this?" Then do it on the ground and learn. When it's in the tree it reacts even differently in the tree.
But you already know all of this.
Just because you know all the knots and how to "dress" them, are you 130% sure they are right? I mean REALLY REALLY SURE? You are putting your life on these.
But you know that also.
So what more would you like us to teach you?
I am an idiot, I know this. I have a lot more balls than brains when it comes to climbing a tree. As I said I used to only free climb, UNTIL my wife watched one day.
I have had to learn this all the hard way myself. I have had SEVERAL GREAT resources and gleaned waht information they would teach me eagerly and humbly. I still don't know JACK!! I am climbing on a hitch that is all but obsolete in today's world, using old style rope and teqnuiches becasue they are SIMPLE for me to learn and use. And without a mentor right here, I cannot trust much of the newer stuff until I can have it double checked correct.
But you probably knew that as well.
So, you knowing all of this, not much anyone can help you with.
Show a little humility, genuine interest, and realistic ways to remove a tree. I think you might get better advice.
But what do I know, I am an idiot.