Forget the chisels. Buy a set of needle files and a small flat rasp. Really small. Get it at a local wood working shop supply. About 6" long and about 3/8" wide. You will use this tool the most so buy 2. I bought a set of files on Ebay called "rifflers". I know a Dremal sounds harsh and I will be spanked for saying it but...it will come in handy. Sanding block, 3 grades of steel wool, 4 grades of sandpaper, disposable rubber gloves, masking tape, stain, and finish. That should get you done in one trip to Loews.
The Best tip of all...before you do ANYTHING. BUY A PROPER SET OF SCREW DRIVERS.