My advice. Start slow. Guitar parts are very complicated CNC router projects. The learning curve with any of those 3 software packages is very steep. but, vcarve will give you the most "out of the box" useage and flexibility. The others may have CAM capabilities, but vcarve (Vectric) has way more to offer you especially being a new user. Personally, I have been using 3D CAD professionally for over 35 years, and using the same software (Pro/engineer) for the last 28. I have programmed 5 axis machining centers as well as 3 and 4 axis machines. I rapidly learned there is a huge difference between being a programmer and a machine operator. All of the demos etc make it all look so easy and it is easy once you know your software and your machine. I wanted to go full tilt 3D at first too, but quickly realized I needed to slow down and learn my machine first. You have a lot to learn ahead of you from mdeling, 2D and 3D to creating a "good" cutter path, tool limits, machine feeds and speeds, material quirks, G-Code output from the software to the post processor. Cutter uses for the different types to holding down your workpiece so you dont crash into your hold downs. Start slow my friend. If youd like to come down to my shop, Id be glad to give you a demo.