Taking the unit apart is kinda tough. I found that a thin rigid Formica Sample to be the perfect tool for dissembly. The guide rod is pushed forward until the bottom is seen. I use the Formica sample to hold the compressed spring back while I remove the barrel. Then the spring is relaxed and the rod and spring removed.
Installation is the opposite.
I do not take my unit apart often, about every brick of .22's or so. Of course I wipe it down and remove surface grit and soot from the unit. I think that the Wilson unit is a good buy for anyone who wants to shoot their carry gun more than their ammunition budget allows. After you get over the inital cost, you will see savings accrue rather quickly. Two thumbs up.