This applies to any fighting game, not just DOA.
Free Step Dodge
YBNDM
Kinda still halfway there :/
Goarmagon
Just learn the frame data on the moves you use the most then build from there. I dont memorize all the frame data from my character but at least know the data on the moves you use. I still have to look up data on certain moves so dont feel bad.
DestructionBomb
It took me a bit from DOA3 - DOA5 vanilla because the game overall changed. The training mode back then wasn't as super open as DOA5 vanilla. DOA5U added more options via R3 for 2 other pages. DOA2 I was completely unaware of frame data overall. For KOF, it wasn't until CvS2 to dig into frame data for 2D.
Brute
To learn how it works, or to memorize the frame data of characters' movelists?
The former was instantaneous. About ten minutes. The latter takes me considerably longer.
The former was instantaneous. About ten minutes. The latter takes me considerably longer.