My suggestion would be to read descriptions of those that you’re interested in to learn if they are labeled or color coded and if they come with easy-to-understand instructions. I’d go to their websites and call the phone number listed to talk with a customer service representative for answers to all your concerns. As a last resort, you could always order one and then return if it it proves not to your liking or too complicated for your level of expertise. Most reputable companies will except a return. My guess is that in today’s marketplace all wiring harness manufacturers realize they have to make installation a pretty simple task to be competitive. I feel like you would do well with most any wiring harness that you choose.

My two cents worth.

Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod