Trying to Graft My Rose Bush

Well, I purchased a mixed graft rose plant and decided to research how it was done. I've found this easy video on how to graft roses so, I am giving it a try. On two, I left a rose on the stem and the other two without the rose to see what they do out of curiosity. If you have done this before, please share your tips and advice...thanks!

Original article and pictures take http://www.hometalk.com/1204176/trying-to-graft-my-rose-bush site