Instruct: Classify Amazon reviews into positive or negative sentiment
Query: HARD TO DO

THIS BOOK IS VERY INFORMATIVE BUT HARD TO DO. BETWEEN REBOUNDING AND THE VITAMINS YOU HAVE TO TAKE AT DIFFERENT TIMES OF DAY AND THE DIET IT'S HARD TO STAY ON COURSE. THE ALKALINE FOOD CHART IS NOT COMPREHENSIVE AT ALL. THE RECIPES ARE NOT THAT GREAT. i CAN'T FIND ANY COOKBOOK FOR ALKALINE FOODS THAT I WANT. I AM DEVISING MY OWN PLAN TO GET MORE ALKALINE. THIS BOOK TAKES A VERY STRICT APPROACH. IT DOES HAVE A LOT OF HELPFUL ADVISE IN IT.