3dskinlayers-fabric-1.4.2-mc1.18.2.jar
firstperson-fabric-2.1.0-mc1.18-pre1.jar
notenoughanimations-fabric-1.5.0-mc1.18.2.jar

{
"configVersion": 6,
"animationSmoothingSpeed": 30.0,
"holdingItems": [
"minecraft:clock",
"minecraft:compass",
"minecraft:torch",
"minecraft:lantern",
"minecraft:soul_torch",
"minecraft:soul_lantern"
],
"enableAnimationSmoothing": true,
"enableInWorldMapRendering": true,
"enableOffhandHiding": true,
"enableRotationLocking": true,
"enableLadderAnimation": true,
"ladderAnimationAmplifier": 0.5,
"ladderAnimationArmHeight": 1.0,
"ladderAnimationArmSpeed": 4.0,
"enableRotateToLadder": false,
"enableEatDrinkAnimation": true,
"enableRowBoatAnimation": true,
"enableHorseAnimation": true,
"dontHoldItemsInBed": true,
"freezeArmsInBed": true,
"keepBodyRotatedWithHead": true,
"showLastUsedSword": false,
"sheathSwords": [
"minecraft:golden_sword",
"minecraft:iron_sword",
"minecraft:wooden_sword",
"minecraft:stone_sword",
"minecraft:diamond_sword",
"minecraft:netherite_sword"
],
"enableCrawlingAnimation": true,
"holdUpAllItems": false,
"itemSwapAnimation": true
}

The character just trembles arms and doesn't show normal motion.

See the comment under Not Enough Animations, I accidentally put the wrong value into the animation so it got stuck, use the version before or wait for the next release(well or just get the dev build from here^^).

same here
imgur
when i move, the animation is stiff, and it spazzes out whether or not im moving.

Like I said, broken in that version, use the previous release or download the dev build from https://github.com/tr7zw/NotEnoughAnimations/actions/runs/2074231823