There is a LOT of usefull info in the JFTR for TDY and PCS.
It is worth reading for familiarity.
Just a few examples:
You only have to check for Non-A once, one Non-A letter is good for the entire TDY, no matter what billeting says.
24 hour rule.
Your boat is HHG, you get paid for the weight of it through a DITY.
Your boat is HHG, you get paid for non-temp storage.