Not enough space on Macbook Pro for Sims 3?

I know this is kind of a trivial thing to be concerned about because I absolutely love my new Mac but I was really hoping to be able to install/play Sims 3 and the expansions that I have for it.

The specs say I have 4GB and the game requires at least 6? I just find it kind of hard to believe that such an expensive computer wouldn't be able to run a sims game...? Am I missing something?

I looked through some forums and everyone seemed to think it would run fine but if there's not nearly enough space for it, how would that work?

I'm just wondering if I should try to get something else or if there's a way to make this work?

I know you can install more memory but apparently the maximum is 8GB and even that doesn't really seem like enough.

Advise, please!