Hollow, Welcome aboard. I'll give you my 2 yen worth, from where I came from.
In a nut shell, yes, you can learn how to climb using the combination of Jepson's book and Treeman's "Tree Climbing Basics" video. BUT,... a few cautionary notes.
Regarding Jepson's book, "The Tree Climbers Companion", 2nd edition. It is a very good book worth it's weight in gold. However, A WARNING ABOUT THE ILLUSTRATION ON PAGE 53 SHOWING THE BLAKES HITCH. It is HORRIBLY WRONG!! The tail should pass OVER the bridge and then go BEHIND the running end before weaving it up through the bottom two coils. The illustration on page 83 does show it properly. This is the only problem I have seen in this book.
Peters video is very thorough. Watch it 15 times before going up the tree. Study it, tie the knots 28 times in your living room before trying them in a tree. Do everything very slowly. Think every move through 6 times from 4 different angles before advancing. If you're wondering about the numbers I chose, it's because I know you'll not do quite that many. If you get lazy and don't do quite that many, you should still be ok. Please prove me wrong.
So, having said all that, even with your prior knowledge and climbing experience, trees are not rocks and the equipment for the two climbing mediums are different. Learn how the tree stuff feels and behaves. AND, find an experienced tree climber and have them watch you set up and tie in. There has to be a tree care company in your area that will have someone who can give you some pointers.
No matter how much you think you know, YOU SHOULD HAVE SOME PERSONAL INSTRUCTION EARLY ON IN YOUR LEARNING CURVE. Can't stress it enough. I first learned to climb while doing line clearance for the local power company. It was all spiking due to working with in an arms reach of 7.5KV lines. But I had good teachers from the get go. I learned the TCI method from Peter's video. But at that time I had been climbing for about a year. The skills I picked up from the vid helped me on the job big time. Point being, I had personal, very experienced instructors early on.
Is the price of the trip to ATL worth it? Depends on how you look at it. I trained with Peter for the Facilitators course. Part of the training was going through the Basics course. At that point I had done a lot of climbing in many situations, and still learned some cool tricks. Picked the brain of the master. To me it was worth the trip from PA.
There's my 2 yen for now.
Ron