Yes, you absolutely should. Go find a CFI who would be willing to do some ground with you to help prepare you for the oral, and make sure that he/she has signed off other ATP students before and that they know the examiner's gouge. Also, make sure you find an examiner who will do the Checkride in the 414. I signed off a couple ATP students but the Checkride was always literally straight out of the PTS (as it should be) and there were no surprises. 4 approaches. 2 precision, 2 non-precision, 2 will be single engine. One will be a no-flap landing. You will have to do steep turns and stalls. Expect a rejected takeoff and an engine failure in the air so he can see you work through the problem. Tolerances are mostly +50/-0 on altitudes and speeds. That's the gist of it anyway. Good luck.