but I have been told by many of my nursing instructors that there is not as much opportunity available in this field (as far as climbing the ladder and burning out).
Well, I've been a psych nurse for 20 years, and that's the first time I've heard that one! I take it these are not your psych nursing instructors (that are saying this ...)
There is just as much opportunity to "climb the ladder" as there is in any other specialty, and I don't see that the risk of burnout is any greater than any other specialty.
In fact, there seems to be a popular misconception that, if you've burned out in whatever your original choice of specialty was, you can always switch to psych because it's "easier." I've run into a number of nurses who have done this, and in each case I've been aware of, it's turned out badly (they find out it's not "easier" and they don't really care for psych nursing, so they leave before long and try something else).
Now, keeping up one's medical skills is a whole 'nother matter, and is
a challenge in psych nursing. There are a number of threads here that discuss the old "year or two of med-surg before specializing in psych" controversy that you may want to find and review.
In the end, no one can decide what's best for you but you. Best wishes --