everyone's experience is different...for mine, we basically went in and did everything that an RN would do, with our preceptor there to supervise us/offer us guidance.
I wasn't just "thrown" into it right away. The first day I kind of just followed my preceptor around and then he had me start giving medications...then as each day went on he started to increase my workload. By the end I was pretty much doing everything by myself and my preceptor stayed away as much as possible except for when he had to check meds with me and he also had to be there to administer IVP meds.
the only thing I wasn't allowed to do was check blood (because that has to be checked by two RN's) and administer this IV contrast dye (I forgot the name of it, but you have to put it in this shaker thing for like 45 seconds and then it turns milky white, kind of like propofol/Diprivan).
Overall, I LOVED my precepting experience. It was exhausting, especially since I precepted at the same hospital I work at, just on a different floor...I felt like I "lived" at that hospital because I was there pretty much 7 days/week and I only got paid for half of the time I was there
...but I learned so much and the experience made me more comfortable with being a nurse. It kind of tied everything together.
I precepted on a cardiovascular surgery/vascular ICU unit in case you were wondering.