I'd do your decs 2 sts in from the edge. Work 2 sts (in patt), then work the dec over whatever the next 2 sts are....could be 2 Ks, K and P, etc. Same goes for the other edge...work til there are 4 sts remaining, do the dec and then you'll have the 2 (in patt) to the edge.
*If* you're working decs on the WS you'd need to work whatever decs are applicable to how the sts show. The back of 2 Ks is 2 Ps so you'd have to work a SSP, etc. But being the patt indicates eor (every other row) all will be done on the same side.
Keeping to the knitting basics