To be a pro seamster, you must be a fast seamster! To be fast, you must be prepared and organized.
Here's an example of something I have to make all the time. These are pieces of Rigilene Boning that are capped with muslin squares and are ready to be sewn. You don't really want to pre-cut your boning, because it is always different lengths, it seems. But, you do want to keep it nearby. The things that I do pre-cut are the muslin squares. I keep them in a little plastic bowl right by may machine. When it is time to make some sticks of boning, everything is within arms reach.. :)
I am not linking to this brand by accident.
It is the only brand that I use. It is the absolute best in my opinion.
For the boning pictured above, I used 1/2 inch.