Well how hard is a pretty general way of asking how difficult it can be. It depends on your previous experience with the PSP SDK, knowledge of C in general, and patience to get things to work. If you understand the PSP SDK, know C, and don't have a problem debugging your creation, then porting a game/application to the PSP (given the source) is a breeze.

Otherwise, it can be quite difficult. Knowledge of both C and C++ is necessary prior to coding on the PSP platform. A lot of people try to learn C on the PSP first; this makes it insanely difficult to code/port complex systems in the future.

Remember, if your source is in C++, you will need to adapt it to C standards (as well as PSP SDK standards). This can be a difficult and time consuming process, so prepare yourself!

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It's not something easy to do. You have to be an experienced coder to port something to the PSP. If you are just starting coding, I wouldn't recommend trying to port something. Start with easy programs or even start on the PC and work your way up to the PSP over time. The main thing when you start learning to code is to be patient!

If you manage to find a program made in SDL, it's relatively easy to port. Otherwise... good luck, if you don't have a lot of experience

Aleph One is written in sdl and they provide the libraries and stuff on the website. What would you need to port it to psp?

Imagine, Marathon on psp... *drools*

Here is a (rather old) tutorial about porting a SDL game to the psp.
Port Tutorial - rRootage example - QJ.NET Forums

But even if a game is written using SDL, it doesn't automagically makes it easy to port.

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i can code but only through delphi....and that's hard enough for me