Motion Tracking Difficulty in AfterEffects 7.0

[Tryptic]

It may almost be easier to try to do enough OP's for someone that I could bribe them into doing it for me, since it's like 20 frames.

Anyway, I'm working (I use the term loosely) on a video using the Cowboy Bebop Movie. Now, if you've seen that movie, you know that Vincent has a tattoo above his wrist. Well, I want to convert that to a different tattoo. However, I don't want to give away what the new tattoo will be, which means I can't actually show a clip of where I'm running into trouble, so I have to try to do it with writing.
Anyway in this scene, Vincent's being filmed from a chopper, which moves a bit, and even with AfterEffects' grid on, I can't really get the motion tracking to look quite right, the tattoo seems to jump around just a little bit on his arm. I tried using the lines of the original tattoo as a guide, but that also doesn't work very well.
I also tried making a mark on the arm itself, but it seems to make a dot on the "glass" if you will, rather than on the image itself. (The dot stays stationary while the image moves.) I've tried looking up a solution, but I can't find one anywhere.
Am I perhaps missing something very obvious?
Or maybe another question is, how much of a "wiggle" will be noticeable if you're not looking for it?

[Zarxrax]

Does anything else in the scene move the same way? Maybe you can track on the helicopter itself, or something.
Also since its only 20 frames, maybe you could manually adjust it. That can be REALLY hard to get looking right, but if you keep working at it for a while its possible.

And if there is jitter, its usually really noticeable.

[Tryptic]

Manually as in... pop it into Photoshop?
That's actually something I was wondering if I could do, edit it frame-by-frame.

Would I just export it as a file sequence from VDub (as if I was making an animated gif) and then edit each frame, and then import them frame by frame and drop them into the Premiere timeline?

The problem is, there is nothing else in the frame. In fact, what I think they may have done to make this shot is simply made an extra large frame and just moved the camera around, since it looks like a wild panning shot. (Or is it a tracking shot?)

[Zarxrax]

No... just move it around in AE. Way easier than trying to do it in photoshop.