That really depends on experience. I remember when I started out with latex that it would take me hours to do the simplest of things but now, I take notes in it in class on the fly and I can handle all the formatting immediately. Also, using latex with an inferior editor will make life excruciating. I would advise emacs with latex-mode (and in my case, several hundred lines of customizations) but vim is also a good choice. If however, you try latex with crap like notepad, nano, pico, or gedit... well, you are asking for hell and you will get it.