[Brentwood Bob]

Remove and replace the pop out can be deceptively simple to do.
Since you are intending to actively do the mechanical maintenance work I suggest you buy the les Andrews repair manuals. Les is very through and will not mislead you.
Almost as good as making friends with at least one local model a club member who can help you thru your apprenticeship.
We could wait for you to make mistakes and then knowingly correct you, but until you make a few new friends, and learn from them, buy the manuals first.