With the slide and bbl assembly off the frame, turn it upside down so you can see the spring and bbl from the underside. There will be a horozontal notch between the roller bearing on the bbl itself. You need to pull that down about halfway forward in the slide. The bearing will unlock and move with the bbl. If you look closely at the inside of the slide rails on the slide, there will be cutouts in the rails where the assembly can be removed from the slide. Pull the bbl assembly forward until you reach this point and then pull it out of the slide.
Those may be the worst instructions in the world but I think you will see what I mean if you look at the inside rails of the slide. The trick is getting something that is stronger than your fingernail to push the bbl and recoil spring far enough forward to let it clear the cut outs.
If that doesn't help, just post again and I will try to be more clear.