I assume that you have experienced the same dilemma as I did with mine. Theres a water bottle at the top, towards the back of the engine - its so far back it could be in the dash.
Its held in with two rubber bands, unclip them both at each side and put them in a safe place (I dropped mine inside the engine first time round!). Once you have unclipped the bottle, it should just pull towards you and out of the engine - the hoses will still be attached so it won't fall that far if you let go.
Hope this helps!
Ben
March 2006