I'm fairly new to the Rails community and recently faced a similar 
situation.  First from what you describe, CanCan will most certainly 
provide the functionality you desire.  

Secondly, there is a nice screencast at Railscasts.com that provides a good 
introduction, however some of processes in the screencast have been 
updated/modified in more recent versions of the gem, so be sure to go by 
the github documentation vs. the example in the screencast.  

Thirdly, I would describe the learning curve for the CanCan gem as 
moderate.  I have a fairly complex use case and my CanCan Abilities class 
has gotten a little large.  However, I've been amazed that each time I 
initially thought CanCan was in error, when I worked it through, CanCan was 
accurate.  Also, I was worried about a performance hit, but so far have not 
seen anything that indicates CanCan will not scale.

Highly recommended gem from my standpoint.

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