What ever you do don't repeat my mistake!
The current microphone rubber cover needs to be removed and installed on the new microphone before installation into the phone.
The new microphone comes with adhesive with a plastic pell off covering that must be removed before installing the rubber cover. This step is missing from the ifixit.com instructions!
I reinstalled it without removing the plastic covering and my wife's microphone was totally worthless. Once removed and rubber cover reinstalled the phone works perfectly!
Really appreciate ifixit, has saved me and my family thousands of dollars over the years.