Is it hard to mod minecraft

Modding is quite easy when you get stuck in. Just learn Java and then go through the Minecraft code to understand its API and boom your done.
Java tutorials - www.youtube.com/TheNewBoston
Look for his beginner Java programming tutorials. I learnt from him.

And mod tutorials, well just youtube it, there's plenty out there.

You need to learn a large chunk of Java. Ints, Strings, Booleans, Floats, Methods, Doubles, If statements, if loops, for loops, while loops, packages, importing packages and referencing variables from other classes and so on.

Looking up tutorials on youtube is your best bet,

I learned to code by poking around in Minecraft's source, but I wouldn't suggest doing it this way as a beginner because it can be confusing at first!