lol! AS much as I knew I'd forget some things.... who'd have thought I'd forget the d**n chainsaw??
Actually, forgetting the chain saw is a real good idea when you first start out. Climbing is dangerous. Chain saws are more dangerous. Put them together in a tree and the increased risk is exponential, not arithmetic. In other words, Danger 8 plus Danger 8 is Danger 64, not danger 16.
"Where to Start"?
1. Got a copy of Jepson's "Tree Climbers Companion" yet?
2. Learn to climb first, without a saw. Find a "Coach" if at all possible, even if you have to hire one for a day. He will save you money in time, equipment, and doctor bills. Start with Rope climbing. If you go to spurs, practice only on junk trees like sweet gum, black gum, trees with no market or ornamental value.
3. Add a hand saw. Start out pruning. Limit yourself to limbs and branches small enough to cut with a hand saw. Hopefully, you will cut small and slow enough to learn how they break and fall before you start cutting anything big enough to kill you. Again, climb on Rope, so you dont disfigure your practice trees. Get Shigo's book on pruning, so you will know how to make the cuts. ISA (International Society of Arboriculture) also has some good computer courses, Google them.
4. Study the Arboricultural Injuries and Fatalities threads on this web site. You can learn a lot from the mistakes of others.
5. "Remember" the chain saw only after you are thoroughly comfortable with 1. through 4. above. By then, you may be ready for Baranek's book, "The Fundamentals of General Tree Work". But its way more than just "Fundamentals". Most of it is pretty darned "Advanced".
Do I sound authoritative? I'm not. I'm just remembering how much pain and money I would have saved myself IF I had it to do over again. Experience is a hard teacher. Gives the test first, then the lesson. IF you survive the "Test".
I'm not trying to talk you out of this at all. It's Great Fun, Challenging, Rewarding, an Adrenalin Rush almost every time. But it is also Genuinely Dangerous.