I have Divinity: Original sin 2 and have for a while. Any reason to pick up and play 1 first or can I just start 2?
Both are exceptional RPGs. I would recommend starting 1. Not due to story, they are independent except some background/world info, but because the combat system is a bit more evolved (and QoL features) in 2. They play different than BG3 due to it being their own system so I personally haven't had the issue of going from BG3 to trying DoS2 again, but DoS2 to DoS1 feels more noticeable since it is the same system.
That said, they are excellent on tactician (but hard, especially in the beginning). Similar to how they build BG3, DoS1 and 2 have all hand crafted encounters, no random ones. So when you encounter something which seems too hard, you can explore and find other encounters to level up and go back later.
I found DoS2 easier to "exploit" than DoS1. In DoS2 it is all about knockdowns. Get a 10 points in a summoner 10 asap (massive boost to pet), and regardless of build get the points in warrior (forget the skill names) for the rush knockdown and the AE hit which knocks down. Focus on physical damage (easiest). You and enemies have a grey (armor/physical) and blue (magic) bar for your shield. Once that is depleted, you can chain knockdown enemies. Once all your characters have those skills, the overall game becomes much, much easier even on tactician. Downside of that is that by early Act2, most encounters are won the same way. I've tried respeccing and going magic or whatever, but anything other than that feels like I am just trying a personal challenge mode to make it more difficult for myself. There is this whole system around combining elements for damage (especially on the ground), but above method bypasses many encounters where it is obvious that you're supposed to implement/use that. Rangers are also great, buy and loot every single knockdown arrow you can find.
PS: they've patched it so skills transfer to the group. So things like lucky find procs on everyone as long as one person has it. I think when it launched you had to make sure to use the character that had the skill. You absolutely want a character with points into that, once you do, try to open
every box,chest, whatever. If 15 crates are stacked on a dock, click them all. Odds are one will proc and you can end up with an item with better stats than a boss drop. It's broken (unless they patched that too).