Yeah, its pretty straight forward. I had my port of 7 yrs replaced March 2005. I went in with my old one (that completely stopped working, nothing in or out) and a few hours later awoke with a new one. My catheter part was old and wore out so they preplaced the whole thing. They did local numbing (I was semi awake...in and out). They put my new one within a few centameters (sp?) from my old one. Due to scar tissue, they had to make a new tunnel for the catheter part. It wasnt too bad. The new one works great.
Dont try to force anything in (you probably know this). When my first one stopped working, it was like pushing against a brick wall. Nothing would move. I would go to your doctor, tell them what is going on and talk about the option of a new one.