I am interested to know why you are considering such a drastic career change? I have sort of fallen into aesthetics myself. I graduated with my LPN in December of 2015, so I am quite new. One of my professors helped me land a job in a Medical Spa as an "injectors assistant". I had no idea what this field even consisted of, but I accepted because I desperately needed income. I am so glad that I did, because 7 months later I still LOVE going to work.
As an LPN I am currently limited in my practice. The FNPC I work for has trained me to do sclerotherapy for cosmetic spider veins, and is paying for me to get my laser license.
To answer you questions, the most stressful part of my job is patient load. The office I work in is always very busy. For your second question, this field could not be more different from standard nursing care. I do not feel like a nurse most days. You never encounter sick patients , and the closest thing to an event is the occasional vasovagal.
I feel that aesthetics can be a "breath of fresh air" for seasoned nurses. There is a HUGE learning curve, especially for injectors. Botox and fillers require an artful eye. We have all seen the aftermath of too much lip filler! I think that the biggest con for this field is boredom. As much as I love my job, I do plan to begin more clinical work when I get my RN. If you are someone who is "Burned out" already, this may be a wonderful career change for you.