I am going to give you a piece of job advice first, then clinical advice. If this is truly the place you want to work when you are done, consider the time that you are there an extended nursing interview. If you are walking into a hospital as a "tech" you are saying, "I am a potential nurse." You are going to be held at a higher standard with the nurses as you are going to be a colleague. You are also going to be observed by the nurse managers as someone who could be a potential nurse on their staff. So, that being said, always be punctual, do your best not to call off work, do what you say you will, if and when you goof be the first to own up to it, offer yourself to assist the nurses with their work so they see you are eager, ask if you can watch any procedures that are happening on your floor, and get ready for an interesting experience.
Now, clinical skills, I assure you that as soon as you get in the hospital you are going to remember what to do. You will be assigned a preceptor of sorts, that will make sure you are up to speed on things. Grab a blood pressure cuff and make sure you can still take one accurately. A lot of hospitals have Dynamaps, so maybe you can practice on one. Other than that, each hospital, each floor for that matter tends to do things their own way, so be open to learning new ways to do things you may already know how to do.