Hello
I currently have Erik, Barbas, and the 2 Nymphs/Bugs as followers. The nymphs are too to cute to dismiss and Erik & Barbas are great help in combat, but the pushing is extremely annoying. I saw on Nexus that there was a mod to turn off follower collisions specifically towards the player. It currently isn't working and I noticed there are many mods that broke in the current build. Is there a console command or something similar that I could use instead? Also what are some achievement friendly mods? I have modded Skyrim on steam, but it broke most achievements. I'm trying to get all the achievements here on gog. I'm trying to play as close to vanilla as reasonable but the follower pushing (especially Barbas) is so annoying.
Any help would be greatly appreciated!
Edit: I did try the tcl command with Barbas selected, but all that did was cause him to walk through walls, the floor, and hover in the air. He could still push me off cliffs.

This was helpful, thank you! However, after downloading (sse engine fixes, skse, and both I'm Walkin Here NG and I'm Walkin' Here NG with Pets) and installing with vortex, it doesn't appear to actually do anything. I'm still getting pushed around, unless I misunderstood how it works? I think I got all the required files. Vortex says they're downloaded and enabled. I did have to change the game path since it defaulted to the steam install. I don't know if it makes a difference, but I do have Skyrim installed on a different drive, not the boot drive. Vortex had me change the working mod path to that drive too.
I did try to install them manually, but that didn't work either. I'm so confused. :(
Edit: I noticed the C++ distro needed is the 2019 version, I can't find a download link for that specific one, but I do have the 2015-2022 version. Could that be the problem? The Microsoft page infers that it should be fine.

Shouldn't be a problem. "2015 ~ 2022" means it includes 2017 and 2019, so any software requiring it should work.

Vortex, not sure. I tried it some time ago, I don't use it anymore as I couldn't get used to the interface, but it seemed to get the job done just fine.

Engine Fixes is customizable ("EngineFixes.toml" it's the file name), to see if it's working, you can try toggling any of its features. e.g.: this value by default is "false", if you set it to "true", when you press F5 the game will create a manual save (new slot), instead of quicksaves.
RegularQuicksaves = true

You can also take a quick look at "skse64.log":
c:\users\......\Documents\My Games\Skyrim Special Edition GOG\SKSE\skse64.log
It's a text file. any .dll that is not working will usually popup an error in this log.

ImWalkinHere disables collision for NPCs that are currently following you. Do you know when you defeat a dragon and you can just walk inside their skeleton? If the NPC is not currently your follower, the mod does nothing.

So it turns out, gog galaxy launches the normal game. I have to launch the skse launcher file outside of galaxy. I'm a dummy. The I'm walkin' here mods do in fact work on my pets and Erik, but not on Barbas. So I guess I'll continue looking for a mod for him.
Thank you for explaining how mods work and all your help!
Edit: just want to add that installing the Unofficial Skyrim SE Patch modifies follower behaviour, so it keeps Barbas back a little further. Doesn't turn off collisions, but makes him less annoying.