Starting corrections nursing

I have been a nurse for a year and a half. I've bounced around a bit from job to job due to moving (unavoidable family situation) and leaving a job that was not working for me. I am currently working inpatient mental health. I enjoy the actual nursing work, but as I am the only RN on site during evenings, I do nearly all administrative duties (my main issue with this job and disorganized management/ lack of training). I started looking for a job- had a few offers and am now looking at starting a new role in corrections via a staffing agency (non-temporary position in a jail/detention center).  I am excited about this new position. I really want to work in a fast paced environment/ where I can see interesting cases/ continue to learn and grow. I have worked in mental health and prisons before (previous career). I didn't mind it, found it interesting. 

My main concerns about this new position: I feel I have good assessment skills/ solid nursing skills to build upon and grow upon. I am however unable to start an IV. I have tried. I have missed every time, and to be honest no one has really sat down and taught me step by step how to do one (other than a few years ago in nursing school). Will this be an issue? 

Also, any advice for me on how to be successful in a prison setting.