Take a CNA course first. You will hear that it is not what nurses do in the real world, true..........sorry, but many RN's (new grads) dont know how to give bed baths, change an occupied bed, etc. We know I will get a lot of responses to that but some refuse to do the work required, if you are not that kind of a nurse, please dont defend those who are.
A CNA course really is the best way to get your feet wet without too much committment, money, time not to mention the change that it will make to your life and those around you.
My advice is just the same as others, you can keep it or discard but you will find at the end of this course what exactly you can tolerate and what you cant.
I will tell you as a CNA (oncology) it was not pretty. The sight toleration issue is not the only area to consider, there is also smell and sound. Questions to ask yourself........have you seen a dead body, will you be capable of holding the hand of the dying until its over, will you beable to place this person in a body bag and zip it shut, will you beable to wash/prepare the dead body, would you beable to be alone with the body, (some are afraid of death, not able to be alone with the body), will you beable to handle the screams of pain coming from a pt., will you beable stomach the junk that comes from open wounds, can you duck fast enough to avoid the spew from a trach........I could go on but these are just a few.
I am point A to B person, so I will tell you straight out......if you cant stomach what you see, hear and smell at the CNA level, nursing at least bedside will not be for you.