As most people have said before me, it isn't a hard game that require boatloads of skill, but its definitely got a different feel than basically every other first person shooter game, because after all, it is a simulator! Although I think you will enjoy it! After a while you will get use to it and then the fun really kicks in, oh and the editor is great fun! Once you figure it out of course ;) This is not an immensely hard game though, you will be okay! :)
Cheers!