I find pen tool is hard to use the first time I use it. But after a while it is a fun tool to use when I have a grasp of it. You can trace the image that you want using pen tool. It definitely need patience but if you do it well the image turns out just fine.
I search pen tool tutorial online for tips and trick to get better at using pen tool. There are heaps of them on the internet and they really help me to do this project.
In class I also did pen tool practice and it is really fun and helpful. We can make illustration of coffee cup and other things we want.