I taught myself by watching JewTube video tutorials for my flavor of software. (FreeCAD) Having two screens, one for the video and one for the software was useful but a single large-ish screen will do also. I had some background in technical drawing and 2D CAD but not a lot. It's not a requirement but it helps to know basic rules of geometry. I only model technical things, no minifigs or artsy stuff. Recommend you start out with low complexity models to get the hang of things and keep frustration to a minimum. It was immensely rewarding btw, to see an idea that only existed in my head, pop out of the printer, so keep at it. I started out by importing geometry I had prepared in 2D CAD and going from there. I wouldn't do that today, the design tools for a sketch are all there in the 3D software but the design paradigm is somewhat different. In 2D CAD you make a 2D representation of a thing and usually someone else will have to actually make it. This means you must communicate all dimensions and parameters through your drawing. It needs to be comprehensive. In 3D CAD, especially if you only model objects for your own use, you can get away with a less strict approach although it'll pay in the long run if your objects are created such that you can open them a year later and still make sense of what you were doing. In standard 3D CAD software you'll have the opportunity to name your sketches and 3D operations. I use this to have some mnemonic naming like: "Hole d4.5" "Pipe cyl D20 d15 h100" Got any concrete projects you want to do? I'm sure others on here would help out if you get stuck.