First with Blender, in my profession I worked with 3D cad software, and for fun I made maps for a video game.
This does help but also to some extent makes it harder, Blender has its own way of working, almost completely different from the software I am used too.
Blender can do amazing stuff though and is free and opensource.
Most cad programs are far from free. ( 6000 and up for a 3 years licence )