By "wood is held in by a brass pin" you mean the cross pins in the buttstock I would NOT attempt to drive them out. They simply reinforce the laminate layers and are not connected to the receiver in any way. To remove the buttstock you need to remove the two wood screws on the tang and under the dust cover where the wood fits into the rear of the receiver.
That wood looks pretty good As-Is! Sure you want to refinish it? Maybe shoot it awhile to see if it grows on you. When I got my first SAR-1, I intended to refinish the wood, enamal the metal and really make it look pretty. After shooting it for a few years I have really become attached to it's "ally-cat" looks.
Its a little like dating a fat-chick. You don't really want your friends to see you with her, but when it comes to the love'n she performs everyway you want her to!
(no offense to fat chicks)
Check out the thumb-tacked threads at the top of the Romanian page. Truly, a wealth of information.