The best way is using a router with a guide and a side cutting bit at
high speed to minimize chipping of the laminate.
If you are going to use a jig saw, use a fine tooth blade for the same
reason. For the sink cutout, first drill at the corners with a bit that
matches the radius of the corner, then cut the straight runs. For the
notches, just go slow to get a truly good edge.
Use masking or painters tape (2" min.) on the good side of the cuts to
protect the finish and prevent scratches and marring of the laminate.
I wouldn't use a sawsall or circular saw, too much chipping and danger