In cooking it's called mise en place, a French phrase that means "everything in place." This crucial cooking term suggests you gather all your ingredients before you start cooking a dish. This accomplishes two goals. First, it assures you have everything you need to finish your dish. Second, it makes the cooking process go faster and smoother because you aren't running around looking for ingredients while your white sauce burns away.
I think this is a great concept, that can be applied to your sewing projects. By collecting and checking all your "ingredients" fabric, thread, cording, wood, etc., before you've begun any project, you can make it go much smoother and much faster.
How often do you have to stop to wind up new bobbins, while sewing 10 yards of cording? Or realize you are out of lining 1/2 way through panel #3? Instead why not institute mise en place in your workroom. Before starting any project, wind a bunch of bobbins in several colors. Clear off your table, gather your scissors and pins and check your lining amount. Then look over the face fabric for flaws.
If you've prepared everything you need before sewing, all you will need to do is roll out the fabric and get to work. No stopping to call all the local workrooms to ask if you can buy three yards of lining and no rethreading the machine mid job.
Just quick easy sewing. Or, the perfect white sauce.

P.s. Mise en place is a great idea when working with your clients too. There's a reason I tell my clients their job won't be done for 4 to 6 weeks until after I've received all the materials. If something is on back order or worse has been discontinued then the client and you, are less inclined to be upset if the job hasn't started yet. Your aren't pushing back an install, but instead are are sticking to your word that you will begin after all the supplies have been received.
Of course it's up to you to order them in a timely manner, and it's great if you can keep your customer in the loop as to the ordering and receipt of fabric date. This opens the line of communications and eliminates problems before they begin. So get those orders in quickly and check the stock of your fabric, hardware and other supplies, and let your clients know you are on top of all their ingredients. It will be much easier for you to set a firm time frame for completion of your projects while keeping you and your clients happy. And if you like to cook, well fed.