Yes, re-fretting is easy, for experienced guitar technicians..! It can be done 'at home', but results can be disappointing, especially if one doesn't have adequate tools for the job. Best done, for the first (and second, and third..!) time on a neck with no particular value.
What would 'slightly larger' frets bring to the party..? If it played well before, have the same fitted, and it will play well again. Remember the old adage : 'If it ain't busted, don't fix it.'