Maybe you meant the cams *lag*, are not advanced?
Some would say you deserved worse for not changing the timing belt long before now. *I'm* not saying that, but *some* would.
My guess on the remark about rotating back to position and not all the way around is they assume maybe you have crank at no. 1 TDC, in which case rotating the cams all the way around would collide the valves and pistons.
As long as you put the crank at 60° before removing the belt and moving the cams to position, and then rotating crank to no. 1 TDC (i.e., crank sprocket mark lined up with mark on oil pump), you should be OK to rotate the cams as much as you want. But
, assuming the cams only moved those few teeth, the best move could be to put crank at no. 1 TDC, remove belt, then move cams to position, and, as they said, directly back to position - not all the way around. With belt on, only rotate engine clockwise (looking at from front). With belt off, direction doesn't matter.