I'm really not understanding exactly what you want to do, I guess.
First you said you want to move your stuff from one machine to another. Migration Assistant would have done that for you perfectly. (You never gave us any details on why that didn't work for you, it's INCREDIBLY rare for MA not to do this job perfectly so I'm frankly wondering how you managed to muck that up)
I guess I mucked it up because I expected the Mac OS to give some hints what to do. I wiped the new Mac's HD and installed a new system. I'm just trying to move some files to the new computer. It's not working.
Migration Assistant kicks in when you first turn on the new machine. It is part of the "first bootup" routine. If you bypassed it at the time, why not just start over?
What do you mean "kicks in?" What would staring over include? Now I've got multiple files with the same file names on the new Mac. Why would the OS allow that? I've got tons of clip art mixed in with my photos. It would take endless hours to separate them
I'm a computer user. I just need to get work done, messing with these automated programs is wasting way too much time. I expect a program like Migration Assistant to be an automatic way to transfer files, specially since I'm working between two Macs on the same version of OSX. I'm very disappointed in these computers. For the first time after owning 5 Macs I'm considering moving to the other system.
If the goal is to move your stuff from one machine to another, the best way to do that correctly is to do it the way Apple designed it to be done: at first bootup. Doing it after you've set up your own account and started putting new crap on it complicates things unnecessarily.
I would love to do it the way Apple designed it. But the system gives no clue on how to proceed. That is exactly what I would expect from an Apple computer...to be user friendly.
Once that has happened successfully, then you should refer to my previous post, which teaches people how to move iTunes libraries and iPhoto libraries to external drive. It's really pretty simple ... just follow the on-screen directions for Migration Assistant and THEN move the libraries to an external using the instructions in my previous post.
I think you're "overthinking" the whole thing, really.