Wow, I didn't realize that this thread had gotten so much attention.  I thought after I started "watching" the topic, it would email me for each post.  I guess not.  Rest assured, though, I read everybody's post and I appreciate them all very much.  

My biggest concern is not necessarily that I instantly learn a good vibrato, but more importantly that I learn the proper technique, start out slowly, and build on that.  I'm just not sure if it is supposed to "click" (as in,"Oh, that's certainly it!"), or if it's just an obscure motion that never really feels "correct".

I am wondering if anyone has a video that goes into all detail about how they hold the violin (including where their thumb is), what muscles they are purposefully moving (for example, are they moving the wrist back and forth or is a lot of it coming from the hand itself), how wide their "regular" vibrato is (as in how much of a tone variation), etc.  I really feel like after all the videos I've watched, and all the practice I've had trying to duplicate what I learned in the videos should have already helped me start developing good technique for a smooth wrist vibrato, but still I don't feel comfortable with it.  

Like I said in my last post, I'll try to upload a video some time this week, but until March, I am super busy.  Thanks so much for all of your advice and help so far everybody!