Flower Arranging

i am absolutely terrible at arranging flowers. i never use the right size vase and i can't seem to cut the flowers to the right height. oh and i never know how many flowers is the right amount. not good. i also can't cook rice which is really weird because, like flowers, rice seems like such an easy thing but mr. r is the official rice cooker in this family. not sure what just made me think of that??

anyway, i saw this book at cup of jo and i think it might just be the perfect thing for the flower impaired.

what are your tips and tricks? p.s. here is my fav florist in boston!