You have two surfaces to deal with. The bolt and the inside.
You really don't want to touch the mating surfaces of the locking lugs unless you have clear evidence that one is not engaging. Brownells makes tools to do all this for 53 bucks.
The bolt body and the rails can be smoothed a lot on an early CZ as they were 150 grit rough. You can polish the bolt body (like buffing a shoe) with fine grit paper and finishing with crocus cloth, ditto the extractor.
The tops of the receiver rails and the bottom riding surfaces of the bolt lugs can be smoothed with a new super fine stone (keep it flat !)
Good idea to soot up the bolt and rails before any work to see what is rubbing where. Or use a bedding black to do it.
Often missed but also worth doing is polishing the inside of the bolt and any parts of the firing pin assembly that rub on the inside. The cocking cam surfaces also should be stoned smooth to ease bolt lift.
some links:
http://guns.wonderhowto.com/how-to/polish-bolt-bolt-action-rifle-204324/http://www.thehighroad.org/archive/index.php/t-734779.htmlhttps://www.youtube.com/watch?v=NtH4vs0vFwQJust take it slow. Clean up everything and test often.
Nothing quite like a "snickety snick" bolt action !
