Tab Automatically Please Help

Alright this will be my last ditch effort to figure this out in adobe, if I can't get it I will Just have to use MS Word Developer.
 
I am trying to make one form that when a user enters a value into a text field and the value gets to the max char length I want, it tabs automatically to the next field.
 
I have read all about xfa set focus and custom keystroke scripts. But therein lies the problem, I dont have a clue about either. I see nothing in my adobe designer saying how to input or use them. And I have looked all over. I see the script editor on the top toolbar but thats all I can find. And I have just about spent 20 hours on researching how to do this and nada
 
I know it's a bother to ask but can someone hold my hand here and give me a step by step or even send an example. I would really appreciate it. I would like the entries to remain uppercase as well.
 
I am using Adobe LiveCycle Designer V 8.0.1291.1 on a 32 Bit Windows Vista Ultimate System