To do a good job, you would be better off raking out the joints with an old screwdriver to get out any loose debris.
If there is any small cracks in the joints, i would use a small angle grinder to widen the joint or a small cold chisel and hammer.
Never use pre-mixed stuff myself, if you mixing your own, 4:1 mix of building sand and cement, dont mix it too wet, you want to be able to take a handful and squeeze it lightly, if it stays together in a ball you are near the right consistency.
A full size brickies trowel is easier to use to push off the cement.
There are pointing tools but a 150mm length of hosepipe will do it if you don't have much to do.
Put some mortar on the trowel, place it parallel to the joint and push the mortar into the joint with the pointer.
fill all the joints and then lightly brush the bricks with a soft brush.
Have some plastic on the ground, this is a messy job