I had no success. 2 main problems:

1) When I first pulled apart the phone using the suction caps, only the glass came off, leaving a half of the display assembly still stuck inside the phone. There is a plastic cord which runs around the glass, half of which remained with the glass, and the other half remaining on the remaining part of the display assembly. I'm not sure what I did wrong for this to happen. But I can't put the phone back together.

2) I changed the power button but it does not seem to have been the problem. In any case, the power button now does not click. And floating bits of what I assume used to be a button (a small silver bubble, and a black dot on a piece of clear plastic) came out when I removed the the power button. I assume now that the power/volume ribbon is the problem, and theses little floating bits belong to it, rather than the power button.

Overall, disappointing. Won't try this again.