I realize this thread is a bit old now, but I just noticed it.
I took the timber framing class at the Port Townsend school in September 2022 and it was an amazing experience. The instructors were fantastic and the class was paced really well. The other folks taking the class were also great and we had a blast building and raising the project. It was honestly kind of life changing.
I went into it having done lots of furniture with traditional mortise and tenon joints with hand tools, and I found it very applicable to timber framing. It really is the same but bigger in a lot ways, though there are some additional considerations, like how to handle big timbers, layout systems (we used square rule), and structural concerns like roof thrust and wind loads. I highly recommend getting "Learn to Timber Frame" by Will Beemer and "Timber Frame Construction" by Jack Sobon and Roger Schroeder. Also, Barr tools makes great framing chisels, easily the best steel I've ever used.
Feel free to email me directly if you have questions. I'm planning on building a timber framed shed/workshop in my backyard this summer. I could make a thread about it here or talk about it at the hand tool SIG if folks are interested in hearing about it.