I played it, but we didn't use all of the heavyweight rules. Our GM walked us through things slowly - do you intend to run it, or to play in it?
I think once you get to the more complex system, the important part is to know you're absolutely fine winging it, and you can look up the actual rules later. Once you're familiar with how things work, you can add in the numbers as you go.
I had a GM walk me through chargen the first time, and it made a huge difference. That, more than rules-light versions, were great for me.
And if you want a rules-light version of Glorantha, HeroQuest is awesome, as mentioned above.