I've done some searching and I'm seeing mention of chamfering being required with them. But most of the posts saying that are 2+ years old. Is that still true?

I've also read a little about chamfering, but I'm having a hard time visualizing how it works. Anybody care to offer maybe a better explanation?

Is chamfering something I could do myself? Would I need special tools? If not, how much does it cost to have done?

The reason I ask is because I stripped the threads on my bb and am looking into a threadless bottom bracket. The YST bb is only $20, but if I'm going to have to spend $40 or more on special tools or having a shop do chamfering, then I may as well go with the threadless bb from VO for $60.