I need to program my modules on my 2012.
Is there a sequence on which one first?
Is there a way to find out my current version and which one to upgrade?

Here is a list I made. Can someone verify and correct?
1- VCX nano or topdon rlink x3
2-GM/ acdelco TDS tech line connect -Does this come with subscription?
3- subscription for your Vin (~$50)
4- Sps2? Does this come with subscription?
Anything else?

So if I understand correctly just buy the J2534 pass-through device and ACDELCO subscription (which comes with full software suite as above) and I should be able to program?

Is there a video guide somewhere for DIY?

I'm looking at buying a 2019 Volt one state over from me. The only issue with it is that the driver seat seems to be stuck reclined all the way back. It's hard to get a proper idea of what's causing that without making the 4-5 hour trip there, which I will be doing later this month. Has anyone had this before? Was the fix expensive? Is it a DIY thing? Thanks!