As a group instructor, do you find it challenging to fit in your own workouts without overtraining?

Not really. My schedule of Group exercise classes changes every 8 weeks. I may be teaching a strength class or a cardio class every other day.
I also teach and take martial arts classes and cardio kickboxing 3x a week at night and a Sat. a.m. kickbox boot camp.
I am not one to walk around and bark cues. I get down on the floor and do pushups right along side you, or punch & kick the heavy bag on the other side of you. I like to sweat with my members and they like that! So I get a workout for them not just for me. They mimic me and feed off of my energy which I feel is very important for a group exercise instructor to be able to do. God forbid I stop and start walking around... they assume I'm taking a breather! LOL
Thankfully my day classes change while my night classes remain the same.

Hi Nicole - I understand your concerns. I teach 10 classes a week and had the same fear. However, a while back I learned to "teach" more and "do" less - and I find my participants like it better, too. I get to walk around - make eye contact - help "push" someone thru that last set, and be part of the class, not just the Instructor yelling from the front of the room. (As a former Manager, I think one of the worst feedback comments I heard about an instructor was "she works out for herself, not the class".)

Now, it does depend on the type of class; in Step - I show the moves and get them started, but once I see the class is rockin - I start walking the room and motivating...taking turns on/off the step. In Strength Training, since my focus is on their form any, it makes sense that I'm not doing the whole class with them - and they are used to me directing and not doing. It's also an opportunity to explain "overtraining" to them.

Currently, I do MY strength training on days that I'm teaching strength - I prefer to workout in the early am - so by the time I teach at night, I've just gotten 2 workouts in 1 day - and I get rest before I have to teach that class again. But, I do change it up depending on when I change up the format of the strength class. I find the key is having a plan for my classes each week, and then planning MY workout to compliment - and vice-versa.