Transplanting The Crown

[TeeJay73]

Is this a valid question: when does one transplant his crown? I've had a hair transplant by Doctor McAndrews, focused entirely on the front. But I do acknowledge that eventually, I will need crown work. Is the crown tricky to transplant? And is there a right time to do it? Perhaps one must reach a certain age? Or one must first finish transplanting his top/front regions to his desired goals, before moving onto the crown? I am just trying to gather a basic understanding.