You could use a wooden or plastic dowel to push out the wrist pin. And in some cases you need to pull it out. So a PVC puller is what I used. Heat application makes the removal and installation much easier. Here are some of the pictures to give you an idea of my homemade tools.
I have use these tools in more a dozen engine rebuilds so far and a very valuable tool for me. I prefer to do a left to right sequence for removal and installation. I can not imagine myself without these gadgets.
Tony