Maybe I'm weird but I want to play every class atleast once, other than maybe fighter
You can respec to your heart's content but you can experience other classes through companions and hirelings but it's a bad idea to do it too much in your fist playthrough. For the tough bossfights you'll need to know how to run your entire party pretty well and it devolves into madness when you don't remember half your skills and abilities because you were another class five minutes ago and different player classes demand different party compositions anyway. It would be wise to settle into a main class and a party setup pretty early so by the time you get to late act 2 or act 3 you know your character and your party very well.
