What Rsanford said!
I've come from a LOT of years of AD&D, and 3.5 and when I picked up Magic World I found it very intuitive and easy to grasp. The BGB was fairly easy for me as well, as long as I left out all the spot rules at first and worked them in as I got more comfortable. That said,
CJ isn't wrong. When I first started reading BGB my questions were often answered by people referencing other BRP materials that I didn't currently have. That was a little frustrating.