ah, my sister has that for playstation one...she cant do the troll bit...i have to do it.....it takes alot of patience and trying over and over again but once you get the hang of controlling him you should be fine.....
when i do fast stuff i usually use them little joystick type things rather than the buttons, for running it makes him easier to maneuver so he cuts corners and moves a little faster.....best thing is to ignore the beans and just find your own way, sometimes they distract you into harder routes in my opinion....of couse im basing this on the playstation one game but i seem to remember it was similar in the pc game too so hopefully it should help with your version....
i actually think the troll in the forbidden corridoor is easier to beat, he moves slower....but that takes quite alot of practise if its anything like the playstation one cos you have to be good at aiming spells and stuff.....i never got past fluffy in my pc game