I'm currently going to ATP right now and that's how I did it. Got the MEI first and I just got my CFII last saturday, no big deal . As far as my oral exam for the MEI went, it was pretty much everything under the sun about being a flight instructor, FOI, logbook endorsments, etc. From my whole month of being it flight instructor, i've found that it is much harder to find multi-engine students right out of the box, not that it matters to much since I will have my CFI-SE in about another month or so.