Yes, NS is a dream compared to brass.
As for instructions, I reckon impossible to catergorise by source.
Take the 3 JLTRT kits I have made, or nearly made in case of 2251.
517 has old school Mitchell instructions probably originating on electric typewriter. Excellent chatty style and informative.
57xx has excellent modern CAD isometrics but virtually no words. Pretty easy to follow.
2251 most frustrating. No meaningful words and little or no explanation except for inside motion. Depends on a CD of pics produced by Ozzyo but don't necessarily match the kit version you have, (2004 or 2007). A good kit but so difficult to work out.