Henri, it's very easy if you have a cutting machine. There are tons of sites that give away free svg cutting files. All u need to do is down load the file, cut it out & put it together. It's ton's of fun and very relaxing.
You need a Cricut machine (older than an E2) and special software. I use SCAL2 (Sure Cuts a Lot) which can no longer be purchased unfortunately. I use another free software program called Inkscape to edit svgs and create them from scratch.