If you haven’t ridden the bike yet, now is an ideal time to start learning the knack of removal rather than resorting to the tool. I used to struggle, but now with a few seconds wiggling, I can undo one that is covered in oil/grime/mud mid-ride.
De-rail the chain to give some slack, look at the powerlink to determine which way the plates are going to slide (i.e front plate could slide left or right depending on which way up the powerlink is installed) and then press plates together whilst sliding the front and rear plates in the opposite direction. Flex the chain back and forth. If its freshly installed its almost certainly poor removal technique so keep trying!