Lindy, you do know that you can pause the game by pressing the spacebar? If the combat is too hard for you, you're welcome to turn it down to say easy or vey easy.
And yes, 4 characters is the minimum party, I'd finish this game with. I'm playing Icewind Dale 2 at the moment, and much to my astonishment, Black Isle had made it so that you need to search for traps etc. And how succesfull you are at this depends on your intelligence ability; same goes for disabling any devices. Can't remember if it is the same in Planescape, though.
Adventure gaming is fun