Pixelation is very easy--take less than 2 minutes. What image editor do you use or have? I can't help you if I don't know what the program that you are going to use is. Is it GIMP, Paint.NET, ArtWeaver, Photoscape, Photoshop, or . . . something else?
Usually the process is: select the area that you want to pixelate, and then under Filters or Effects, choose "Pixelate" (sometimes it is grouped under "Distorts")
But of course, one you are familiar with image editing and become an advanced user, you should try out GIMP. It's free and it has advanced tools and features. It is a little bit too complex for beginners though.
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