I do not hate my SD22 but I can be pretty negative about her. She is lazy, not too bright, lies a lot, and tries to manipulate DH and I just get sick of it. I do not hide it if I think she's lying or doing something stupid, I let DH know exactly what I think.

I think I do it to make sure he is not falling for her bullshit. He knows she lies but I make sure to point out all of the inconsistencies in her stories and give my opinion as to why they don't make sense.

I should probably stop. He already knows he can't trust her, he doesn't need me rubbing it in. But I just want to make sure.

I feel the same as you about the three adult skid daughters. I never want to see them ever again. They are banned from my home. They are selfish, abusive, narsassistic bi$&@hs.
I am struggling to regain what I had with DH before the MSD train wrecked her life and stayed here for five weeks almost two years ago.
Anyway. Long story.
Still have PSTD over it. DH and I cannot discuss 'them' without it being a trigger. It is getting better for me slowly turning to indifference.
My sin is holding in resentment against DH for how he was while she was here. Fence riding, throwing me under the bus, not standing up for us. And the other ongoing sin is checking his phone for text from them. He does not lock the phone or erase the messages right away. It gives me a way to stay informed without talking about them. It is better that way. Sometimes I can head things off at the pass...like when they wanted to try to pick a time to see him to collect their Christmas loot...on Christmas Eve...errr no...we will be at church then celebrating the real meaning of Christmas. Anyhow...another long story.
As time goes on I can read the info and just shake my head at the ridiculousness and hoops they want him to jump thru....and he does. I don't get it at all.
I just tell him nothing has changed for me with them. The ban remains. I will never be made to feel so disrespected and invisible in my own home again. Not even for a minute. He can see them elsewhere. It must not be that important to him or he would make arrangements to do so. The man has six weeks vac time a year that he doesn't even use all of it. The one ysd lives nearby. Not seeing his grandchildren must be hard but perhaps that is the trade off to stay away from their abuse and bull crap.

Oh I digress...what was the question? Sins. No one is perfect...we just have SC who think they are.
Drinking too much to cope will only harm yourself. Don't give them the satisfaction.
I obsess about it too much....that only harms me. This new year I resolve to stop doing that. I am working on my life. They are not a part of it.

What can I do to make my life better this year?

I'm standing my ground.

There will be a battle over custody/child support in the spring. I will help DH with legal fees but I will not let him give in to his ex and get trampled on again.

DH and his ex came up with some stupid parenting plan and CS agreement that basically gave him 50% of the responsibilities and 0% if the financial benefits that come with that. He had the kids eowe and half the weekdays and yet paid the bitch as if she had full custody.

There was nothing I could do about that. They made that arrangement before I was in the picture. Nonetheless, I resented it like crazy.

They mutually agreed (verbal agreement) last fall that it was way too chaotic for everyone, especially the kids, to have their school week split like that. She has the kids during the school week, he gets eowe.

Things have been great for us since then. I'm not as resentful about the money since now it is actually on par with what she would be awarded by the CS model our state uses.

She thinks they will go back to the old arrangement when school ends. Sure. That's fine. But CS will have to be renegotiated through mediation and then through the courts if it comes to that.