Consistency is very important when practicing IPT. The more consistent you are, the more successful you will be. This doesn't mean it has to be an all-or-nothing endeavor; plenty of parents do this on a part time basis for a variety of reasons. If you can't commit to doing this full-time, whether for work related reasons, or just your own comfort level, do try to be consistent with those times when you are practicing IPT. For example, always take the baby to the potty first thing in the morning after they wake up, and after naps when you are with them.
Consistency is also important when cuing the baby. Pick a verbal signal and stick with it. The baby will eventually "get it", but it does take some repetition. If you're constantly changing the signal, it will confuse your baby. We have the most success with the verbal cues that mimic the action you want (ssst for urination, grunting for defecation). Also, if you're teaching the baby sign language, be consistent in that too, as the more you consistent you are, the more quickly they will learn.
It does take some self-discipline to do this, but soon it will become just another part of your routine, like feeding and bathing your baby. Don't let your first few potty attempts fool you, you will get faster at undressing/pottying/redressing the baby. Eventually it can become just as quick as a diaper change.