25 years old, receding

[wic86]

I am 25 years old and just began to notice my hair line receding close to the temples, forming a rounded windows peak. I'd say I'm between a 1 and 2 on the norwood hamilton scale, so nothing too drastic. I am however concerned that it will inevitably continue to worsen, given the fact that baldness is quite prevalent in my family and my young age. I will definitely get a transplant and have begun researching doctors. My question is, is it reasonable to gradually get the transplant while I still have a relatively thick head of hair? I don't want to appear bald for a sustained period of time and would rather get the transplants gradually while I can still grow it out and hide it. Thanks for your help!