There are a few videos on YouTube about the process. Basically you're going to put a hole from the front to the back of the packer, insert something into it to maintain the hole (packers are really rubbery - if you just punch a hole in it, it'll be there, but you will not be able to force liquid through it), and fit a method to pee on the other end. I did this with a medicine spoon.
What I did was take a screwdriver and put it through the packer (starting where you want the pee hole and pushing towards the balls if there are any). Then I pushed in a medicine spoon from the ball-side. It isn't hard to do. I'm not crafty either

Only thing to note if you go the medicine spoon route or something similar where it's already pre-made, you may need to opt for a small packer, otherwise you'll have to find something to support the rest of the hole you made. I have the XS Mr. Limpy, I think it's either 3" or 3.5", and it worked perfectly.