Single best video on the topic of dimples I've seen:
https://www.youtube.com/watch?v=Qo9QCMaNSoA
Part of the fun of participating in VAF is the lively and passionate discussion of topics like priming, dimples, tools, techniques, etc. And of course tapping the wealth of knowledge and experience here.
But the "downside" I've found is that - like politics and religion - there will always be "factions", dogma (that varies among "factions"), and to some extent "shaming" when something like a dimple, a rivet head, or other piece of work is shared here. What you will (hopefully) learn as you get into your build is what is "good enough" - for you - and more importantly safe and secure. Sometimes you just have to decide to live with a result that is less than perfect or ideal but is perfectly safe and functional.
One saying I heard early on in the process that stuck with me was "I want to build a go-plane, not a show-plane". Where you fall on the spectrum of acceptance of "good" versus (a debatable standard of..) "perfect" is a decision you'll have to make pretty much every time you go to the shop. Another favorite saying of mine: "perfect is the enemy of good".
I've tried to learn some practical lessons by listening to people like Vic Syracuse who see the results of workmanship over time and get a really good sense of what "matters" in building an airplane: what are the failure modes that result in unacceptable/dangerous outcomes? Should I care more about perfect rivets and dimples, or avoiding mistakes like loose/disorganized wiring, loose jam nuts, etc? (rhetoric admittedly as these are not mutually exclusive). This kind of expertise is practical in the sense that it will give you a much better perspective on where to focus your efforts.
Another good sanity check resource is to call or email the customer support team at Van's: it's very comforting to get a "build on" verdict when unsure about something. I've recently been in touch with them about a finding related to a service bulletin (fix it), a slight misalignment of elevator counterbalance horns ("build on"), and how to deal with a wire routing question. All by email, easy and helpful.
One thing is for sure: if you plan to build the perfect airplane, know that it will take a very very long time....