The video they have shows you how easy it is... The trial will give you the confidence you need to purchase the product... The guys here will help support you as long as you try to use the search feature and also try it on your own first.... So overall probably the best community and product you will see on the net...
Now remember at 50 bucks for the product your not going to make the next halflife game with it but I have seen some pretty good FPS Games made with it like Butters Attack Of The Fireflies for instance...
You may want to check out the showcase section and download some of the games that other guys in this community has made and see for yourself...
Hidden things are since this is new to you modeling costum media should be addressed... There is a robust amount of media that comes with the product but soon you will outgrow that and want to venture out and learn how to build your own... There are alot of good programs out there that are either free or cost is at a minimal thanks inpart to the guys in this community...
But be sure your ready to learn and have alot of fun I know I am...
Also yes this is capable of multiplayer but it is not it's strongest point of FPSC...
Have you downloaded your CLiPs today.