The above instructions worked fine for me as someone who has never done anything like this before … watch is now back to being fully-operational with the latest version of android wear and great battery life. I too used fonejoy .. delivery within 24 hours :) I’d never tried re-connecting this type of PCB connector before and fiddled around for some time before realising that they click into place quite easily. This is probably a 30 minutes job for most of us rather than 5 minutes.

There is an o-ring type seal connected to the backplate. As long as you are careful when taking the backplate off and also make sure that the channel this fits into when you re-assemble is clean, you should be OK. It’s only about 1mm from the edge of the backplate, so don’t dig too deep with your loosening tool when taking the plate off.