My problem with my MkIII isn't that I can't figure out HOW to do it. It's that it's so dang tight to the frame that I was having a hard time getting it to line up.
After taking it apart the first time, I couldn't get it to go back together. I took it back to the gun shop where I bought it, and the guy that sold it to me looked at it a bit and said, "Well there's the problem." He then proceeded to smack the business end of the barrel with a few sharp pops from a dead blow hammer to drive it back the last 1/16" that it was lacking for everything to fit and line up. It went together like butter after that.
Certainly not as easy as a Glock, but as long as you get around the initial tightness of the fit it's not really that difficult to do.