I have been biking for a few years now and have always used tubes underneath my tires. I am in the process of building up a new bike for myself and I am thinking of making the switch to tubeless. My friend has tubeless on his XC, but my knowledge of them is pretty limited. I know he has that weird goop stuff inside his tire, and I know they are a helluva lot lighter than my wheels.
So, school me on tubeless. Whats the mounting/dismounting process? Easier/harder to fix on the trail? What does a beginner need to know?