Emily you will be fine, I am not exactly petite myself!
Some guys will prefer a teeny weeny girl others a buxom wench!
Re massage tips giving a nuru massage, there is no standard, http://www.nurumassage.com/ is a popular porn site show casing nuru massage, have a look, but us western woman develop our own individual style, all you need to do is hang on tight by whatever means possible, that is why I prefer doing it on a bed, head boards! Just slip and slide all over, rubbing ample assets! It is fun! Much giggles, bumped heads but something they will remember!