Well, I cannot help much, but just join you
I am just about starting seaming my jacket and I hate the idea. My previous sweaters do not have a nice "invisible" seaming. On the contrary, they look pretty bad. I know I have been doing something wrong: I have been joining the stitches themselves instead of the bars between the last stitches of each piece. I recently realize that watching Amy's videos here and making an effort to understand the seaming instructions.
So, I am hoping this time I will be very aware of what I am doing and won't scream out of frustration