I don't know if you should get pro or not, maybe someone else can make that decision..but that is basically based on wether or not you can afford it and wether or not you need it right from the start.

Multiplayer scripting is tricky, I agree with nipx on that. However it is learnable as well. The main thing is learning where functions take place...on the server or client, and so forth. I am no expert in mutiplayer, not even close. I am just sarting to learn this side of scripting. However I can tell you it is in fact learnable, but it has a steep learning curve to it.

until you have at least a basic knowledge of c-script itself...you really can't learn mutliplayer. Well you can, but with the tutorials currently available they all pretty much require some sort of working knowledge in c-script itself. hope that helps you out in some way