Re: How mouch do I have to do ?
The first tumble is enough, my key purpose in tumbling my brass is to prevent introducing grime (and wear) into my dies. I hand wipe with a soft cloth to remove lube. A second tumble after decapping can introduce media crumbs into flash hole, blocking them. I always give my brass a quick visual inspection to ensure I can see light through the flash hole, just to be sure.
Unless my chamber was made with a tight neck reamer, neck turning has a very limited benefit. Chambers made to SAAMI standard chamber specs are loose enough that major efforts toward neck thickness and concentricity are probably only partially effective.
My flash holes get reamed once as part of initial case prep. Doesn't hurt, isn't a lot of work, and I think it helps.
I have never cleaned primer pockets; as long as the flash hole is clear, I figure I'm good to go.
I set the drop, then weigh ten accumulated charges. If the sum of the charge weights divided by their number falls within .1gr or less, I will drop without weighing individual charges for sighters and practice loads, but will weigh each charge with match for-score rounds. Load development test charges each get weighed.
If the sum, divided, is greater than .1gr; I will readjust the drop until it is less. Ideally, it should come out to less than 1/2 of .1gr.
I do some other things, mostly tricks of my own; but I won't recommend them because I can't say for sure whether they really help or not. I believe that some of them may do little more than inspire my confidence, but I also believe that's probably a good enough reason all by itself.
Over a bunch of years, I've done just about every reloading technique and trick I've heard of. In general, I believe the simplest way is the best way, and that the key is in the consistency with which I do the basic steps.
For me, handloading is not much more than a necessary evil. Do it right, but don't let it take over the bulk of your efforts.
I do what I must as best I can; and willingly surrender what gains the rest of the techniques may or may not buy me. I figure that if I can meet my consistency goals, I'm not surrendering very much at all.
The time that counts most for me is what I spend at the shooting bench, and not so much what I spend at the loading bench.
Greg