I suggest you keep it simple.
each 'technique' has its pros and cons.
i simply press my finger into the substrate a half inch or so, in my case it is 70/30 coco+perlite. I give it some very light 1/4 strength run through of nutes. with soil, just make sure it isn't "hot" soil and just use plain water. i make sure the seed rests sideways - because i forget which way it opens up, lol... sideways is good. even upside down isn't too big of a deal as the growth tip will react to gravity. Gently coverfrom sides and gently tamp down.
substrate should be fluffy, not compacted. by pressing a finger into it, you create a slightly more stable basin for the seed -- that way it doesn't sink further into substrate as you cover/tamp down.
i'd do it as simply as possibly to form a good baseline. then, try new stuff and see if it actually lives up to what people say. a dome can be worth it if you live in an arid place. a heat mat can help with lower temps / early growth / clones.
I think keeping soil at a proper temp, only an issue in a colder climate, definitely helps with consistency of timeframe for germination. Keeping a low VPD in seedlingn stage is probably useful for the young sprouts, too.
The seeds that fail or likely to fail no matter what. it mostly has to do with their age. soaking won't make an inviable seed viable again. It may reduce the time for it to germinate? h2o2 can disinfect as well as make the outershell a bit softer.
i don't soak for any specific amount of time. when i start the process i plop seeds in labeled cups. then i get the substrate ready. Lately i use a heat mat/dome, so i wait for the substrate to get to the proper temperature. It's certainly not soaking over night, and i get 2-3 day germination rates planting directly into the substrate. So, it's poping a taproot and growth tip within 24 hours, then groing a short distance in order to sprout. By the time yousee the sprout, the taproot has traveled just as far in the opposite direction.
Succintly:
press a hole, plop it in, loosely cover and tamp down... 2-5 days later most will sprout. give up to 9-10 days before you can assume it has rotten.
don't fiddle with it. Don't pick it up and move it around 5x daily. don't dig around. just leave it alone. resist the ocd behaviours.