Is uncloging a kitchen sink a job i can do myself?

yes. what usually makes it worse is drain cleaner - once that's in the pipe you can't plunge safely. the order: block the overflow or second basin with a wet rag and plunge. if that fails, bucket under the trap, unscrew it by hand (plastic ones just twist), clean it out. most kitchen clogs are in that trap. past the trap, a drain snake in from the trap end. baking soda and vinegar is a nice fizz and does roughly nothing.