My first instructions were SBB as well, and I just bought TOTT's a few weeks ago.
I at first used wired. Now looking at those bows I made in the beginning I no longer like them. I then decided to try the elastic thread that Michelle mentioned and I loved it!!! You can move the thread after tying it off if you feel it's off center.
After using the needle and thread with TOTT's I really like my centers better. They are a lot tighter than I was getting with the wire.
Don't give up!! I'm slowly making sure all of my folds are in a correct angle and I can make the bow perfect the first time instead of folding it over and over.