Even for experienced woodworkers I would still recommend a kit.
When you get stuck on a problem or are unsure what step to do next, the kit eliminates one variable making the whole process smoother. There will still be plenty of opportunity to cut and layout your own parts as the kit doesn't include everything.
Something I didn't know which made me glad I bought a kit is that the CNC marks the parts with layout lines so you know where parts intersect. Having to measure and lay those lines out yourself would be a lot of work. The "pen" in the CNC does that for you saving a you a ton of fussy measuring work.