<p>I planning on getting a resin 3d printer kit, and I don't want to take any risks building it myself.  Where, or who, could I hire a professional capable of constructing a 3D printer kit? They don't necessarily have to specialize in constructing 3d printers, I just need someone qualified with the mechanical and technical skills for the job.</p>

If you have a makerspace in your area, you'll likely find individuals with reasonable mechanical skills suitable for simple kit assembly. Most kits are engineered to be reasonable assembly, not rocket surgery. Makers are by nature capable of construction, often from raw materials, and kits are typically not particularly challenging comparatively speaking.
Resin 3D printers are also simple in construction, as the component count is less than that of an FDM printer, or quite close in count. SLA designs involve laser modules, mirrors and alignment, while DLP designs involve light projection and light masking. Both designs involve vats and movement mechanics.
Even if you do not have a makerspace local to you, consider to contact one that might be nearer than farther away, as those spaces may have leads for you to locate a suitable victim/candidate.
Our local library makerspace often farms out contacts to me or other makers with the necessary skills to meet a patron's requirements.