In my experience you need to insulate the hard drive cable from the case, you can use insulating tape, in many cases you dont need a new cable, in case you have to change it you can insulate it before you put the new one to prevent the problem from appearing in the future.
You can boot your mac to the recovery pressing command + R while you turn on your mac, configure your wifi and then create the partition in the ssd using disk utility, then you can clos disk utility and proceed to the instalation of the OS, the installation will be downloaded from the apple servers so it will depend of your internet speed how long will it take.
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You can boot your mac to the recovery pressing command + R while you turn on your mac, configure your wifi and then create the partition in the ssd using disk utility, then you can clos disk utility and proceed to the instalation of the OS, the installation will be downloaded from the apple servers so it will depend of your internet speed how long will it take.