Good quality scissors are sharpened and oiled regularly. With respect to the oil, your new pair of scissors may come with a bit of excess oil in the joint where the screw is. Please take special care to wipe down and clean your scissors for the first few uses until you are sure no excess is leaking.
Scissors are an investment and there are ways to keep them as functional as the first day you got them. Like anything else, good care and maintenance will make sure you get your money's worth for years to come.
You will need a soft fabric cleaning cloth, a screwdriver, and scissors oil. General household oil will work as a replacement. You may already have some of this that you use for your sewing machine maintenance.
Clean and oil your scissors using the following steps:
Using your soft cloth, wipe down the blades removing any lint or dirt that has accumulated.
Open and close your scissors to make sure you get bits around the joint.
Put a few drops of oil on the pivot point of the scissors.
Open and close the scissors to ensure the oil works its way into the joint.
Using a dry part of your soft cloth, wipe away any excess oil.
High quality, professional style scissors are adjustable at the joint/pivot point. You can adjust the blades by tightening or loosening the screw holding the blades together. You'll know when you get it right because you'll hear that fantastic "schnip" sound when you open and close them. Scissor blades should never be so loose that they flop open. If this is the case, tighten the screw and you should be good to go.
If you can find a professional scissors sharpener in your city, I highly recommended getting your shears sharpened if they are feeling a bit dull. Remember, shears and scissors are investment pieces, especially the big fabric and tailor shears. They are made to last for decades. Don't make the mistake of buying another $75 pair of shears just because your current pair doesn't seem to have the same edge. A quick sharpening by a professional will take away all your dull woes.
As mentioned at the beginning of this page, keep a soft fabric cloth with your sewing kit or your stitching and make sure you wipe down your scissors before you start. This precautionary move will make sure you don't ruin any fabric or floss accidentally.