Hmmm, I can't think of the name of our catheters
, but I know that once you are in, you advance the catheter as you pull back until the needle completely retracts and clicks. I am pretty sure ours is the ProtectIV from J&J also.
If your device is like mine, one thing I found helpful when starting out is to look at where the end of the catheter is in relation to the tip of the needle. I used to puncture the vein, get good flashback, and then start advancing the catheter while pulling back on the needle. I would blow it every time. I figured out that once I punctured the vein, I needed to advance the whole thing just a little bit more before I started to pull the needle back and advance the catheter. I was not getting the catheter completely in the vein.
It is a skill that you will master with practice and getting "a feel" for how deep to go, when to advance, what angle to use, etc. My hospital didn't send us to other depts for IV practice either. They said that pregnant women usually have such good veins that they would be the best candidates anyway.
Like others have said, grab as many of your coworkers' IV starts as you can! Good luck!