Degreeing Cams

[Rat72]

I'm installing a new cam in my BBC. I thought I would try something new and degree it but between tools and hassle, I wonder if it's worth it? Comp Cams says they advance all their cams by 4 degrees. So the stock options are 0, 4, and 8 degress unless I use cam degree bushings. Is it really worth the $100 in tools and time to do this. I would be done by now if I just lined up the marks and called it good?

Oh, and what is this cam button they talk about in their install directions. The motor didn't have one of those before, is it needed?

Thanks,
Whit