I'm not sure if I completely understand your question, but if you mean "what kind of skills do you need?", then the answer is that you need at least decent familiarity with C, the surrounding toolset, and a general understanding of how Xorg etc. works. In general, you'll need a few years of experience.

I don't think suckless is for everyone; it's pretty explicit about that. I think that's okay: not all software needs to cater to all users; suckless is mostly a hobby project by some devs for their own purposes.

I sometimes see people recommend dwm or st in "what {WM,terminal} should I use?" and I think it's a terrible recommendation, because most of the time people asking those questions don't have the required skill set to be able to use it effectively (not yet, anyway).