Well, I am quite sure that you being a super expert and all that the above is easy for you to say.
But the truth is that I have been able to modify the default theme nicely so far. All new colors, a custom header above the non-existing header to make the page look like the rest of the website pages, and a few other customizations.
The only problem I have run into is making your "user_login-out plugin" do what you infer that it is supposed to do (put a login and a logout link on the page).
I would have sent you a donation if I could get this to work. I thought perhaps your user forum was the place to get the help I need, I guessed wrong.
I think appropriate for the situation here and in keeping with the topic, is a friendly reminder of that old ZEN saying, “Before enlightenment; chop wood, carry water. After enlightenment; chop wood, carry water.†I won't require you to go read any elusive documentation to understand the meaning of it, I will share that with you here. Even after one becomes a PHP Guru one cannot simply sit and bask in the wonderment of it all, rather one should still perform, even enjoy, the mundane tasks.