If I'm not mistaken, there are an unlimited number of Presidential nominations that may be awarded, but there is a limit to the number of appointments given to holders of Presidential nominations. I think that there are 200 or so appointments for Presidential nomination holders, but I may be wrong.
So, assuming that I am close to the mark, it isn't "hard" in the traditional sense to get the nomination (I send my thanks as well to the OP's dad for his service), it's very competitive to get the appointment.