Being a good instructor takes time and effort. Don't slack off, try your best and know the material. I say that it takes about 3-4 months of teaching full time to get really good at instructing. You'll know that you can teach well when you get students that other instructors have trouble with.

I remember taking over and teaching a student who had flown the same lesson 12 times with another flight instructor. Needless to say, he had some issues, but none that couldn't be resolved in an hour of flight training by trying different things. This instructor had 50 hours as a CFI at that time and I had a 1000. People learn in different ways, what may work for one student may not work with another. As a flight instructor, you need to know how to convey the same message to a student in multiple ways.

I vote for getting your CFIs.