Surprisingly, you can accomplish a lot of DYI projects from YouTube videos, but comic book pressing is not one of those. Anyone willing to share their process is either not doing it right, or not sharing all the information needed to do it correctly. Part time effort won't cut it in many cases, you need to be in it as a career if you seriously want to pursue pressing, and that pie is continually shrinking, so good luck if you decide to do so. As others have mentioned, doing it for fun would be okay, except these books end up in the market at some point. Not to mention you won't have many comic friends if they know you are ruining good books, by pressing or any other action.