Totally depends on what you're thinking of modifying and how you want to modify it. Some experience gained through one modification also carries over to others,

Totally depends on what you're thinking of modifying and how you want to modify it. Some experience gained through one modification also carries over to others, even when done on different programs. I've done modifications that only take a few minutes, and I have my systems setup so it's really, really easy to pick a package by name to modify it and distribute the mods to all my machines, complete with version control. I very much appreciate the ability to modify the free software I use.