I bought into, got myself a ramline spine tester.
I think it helped, but after buying a shooting machine, still had to rotate nocks. On arrows that come with spine alignment, I ignore those too.
Same thing with bareshaft tuning. I still need to rotate those too.
On a hunting bow, I don't worry about it. If an arrow consistently Flys outside or edges of the group, I'll rotate the nock, it will show more with broadheads, but sometimes can tell with field points. Most of my arrows shot in competition get tuned to the same hole with Hooter Shooter.
To answer the question on what is probably the best thing for an average archer to do without a bunch of equipment...
Look up Tim Gillingham's videos of paper tuning fletched arrows thru paper. He will shoot a group of arrows, in different nock positions thru paper. Find the most consistent tear, rotate all the nocks for that tear. Haven't done it, bit makes sense, don't think it's the same as tuning thru a shooting machine, but it's a good start.