I want to get a psp-3000 from Japan so I can get it for cheap but can I mod it and change the system region to USA?

First thing you asked is whether it's a good idea to downgrade your PS4 when it's already modded. Obviously not a good idea if it functions and works with the games as intended. There's a reason why you should never watch video tutorials because they not only become relatively outdated, but if it involves critical steps like modifying the system with non-working methods, then you are held responsible for any damage that it may cause.I want to get a psp-3000 from Japan so I can get it for cheap but can I mod it and change the system region to USA?
So how can I change the region without fucking up the psp?First thing you asked is whether it's a good idea to downgrade your PS4 when it's already modded. Obviously not a good idea if it functions and works with the games as intended. There's a reason why you should never watch video tutorials because they not only become relatively outdated, but if it involves critical steps like modifying the system with non-working methods, then you are held responsible for any damage that it may cause.
As for region changing your PSP, there's no point in doing so if you install custom firmware, which already has region free patches. Permanently region changing is possibly the worst thing you can do to your console, and in many cases, you can end up bricking it.

Follow the guide for installing ARK-4 CFW. There are dedicated sections for which method you prefer using.So how can I change the region without fucking up the psp?