What Beanflicker said is pretty good advice.

To add to what he said, when you first start watching the masters on YouTube dont worry if you dont start picking up the true beauty of what they do immediately.

The more you stick with boxing and come to understand it, the more you will recognize the amazing things they actually do in the ring.

For example, you may watch a boring, chess match type fight and get bored with it because your not picking up on the very subtle things the fighters are doing in there that no one can understand if they dont know the sport.

Even in exciting brawl like matches there are amazing things you will eventually start to recognize that you didnt see when you were less experienced.

These are the reasons why I never hesitate to watch a fight more than a few times.