You guys failed at which step? I'm lucky enough to succeed at the first attempt on my UMobile sim, prior to the actual sim mod, I tried on unwanted sim/sdcard, but I realized some chips are not favorite to this mod due to the thickness on the chip, example on my abandoned maxis sim.

The tray is a bit tight, I'm ok with it because I don't plan to eject it regularly.

Did u use lighter to heat up the plastic? Just a few seconds expose to fire, the plastic will get bend/melt, before the plastic get cold and reformed, quickly separate it using a sharp objects such as cutter. This is what I did.

The sim separation is easy..i just use hairdryer to heat up n it comes out without bending the chip..