I design in 3D cad so I will tell you an easy approach for testing things to begin with. Designing this way you will learn the basic CAD skills one at a time and then slowly add another skill for the next phase of the design.
Start with building block shapes, do not try to put any details on them such as doors, drawers etc. First get those block shapes to fit the space. Each block represents a cabinet or a space such as a bathroom. Those blocks will be enough to give you the information you need to decide on a layout.
Next cover the blocks with virtual sheets of plywood. You might have to make the block smaller to account for the thickness of plywood. Then use the holes in the program to cut openings into the plywood for door and drawer openings. After that you can start adding sticks of wood inside of the cabinets for the framing. So take easy steps and just like a child begin your excursion into the world of 3D building with a set of colored building blocks. I have been designing things in 3D CAD for a lot of years but I still begin many projects that way because those simple basic shapes let me really focus on pleasing looking overall proportions before I start getting into the detail level of the designs.
This first CAD image was taken during a transitional phase of creating the model. There are still some basic building block shapes in it such as the overhead cabinets, the cabinet under the couch. But on the right is the bathroom in the stage where I have transitioned to sheets of plywood with holes cut for doors and further back from the bathroom shell is a cabinet where I started detailing the interior framing structure.
This next CAD image is where I was working on the underlying framing for the cabinetry. I make my cabinet frames from aluminum angle. I have the most of the plywood pieces visually suppressed so I could see the interior framing that I was detailing.
And here is some of the actual framing completed.
So learn 3D CAD as you go in very easy steps. You really don't have to be a master of it to start working on the design. It is a natural way to learn as you gain rewards for your efforts right away. Don't spend a lot of time on trying to make surfaces realistic in a CAD model, you will have the real thing to look at soon enough
To answer the original question in this thread...would I do it over again. I am on my second remodel, started it while I am still finishing up the first one.