Take a couple of hours and follow each one step by step, remember to download Minecraft Coder Pack (link in both those tuts) and Java Develpment Kit. These two threads will guide you through installing what you need and the very basics of modding.
Hell, I just learnt the basics today lol. They really helped!
And if you wanna make your own blocks, get GIMP (google it) to edit the Terrain.png and make your own blocks