Ooowwww, I don't think I belong in this thread but I've never let that stop me before :>).
I don't change with every new project (more likely when the machine begins to sound "strange");
I just throw the old needles in the trashbag (I know, shame on me);
I enter these comments to let the newbies know that you don't have to be perfect and you don't have to follow all the safety rules. Some may want to use me as an example for instituting the elusive "quilt police" we all talk about
I'll try to do better, now that it's been brought to my attention.