Soldered RAM is just about impossible to upgrade/replace, you have to desolder it and do a bunch of other tasks. I have only ever seen one person do it on a modern laptop and it looked horrendous: https://gregdavill.com/posts/dell-xps13-ram-upgrade/
I would just completely abandon any plans to upgrade a soldered RAM laptop unless you are extremely skilled.
Unsoldered RAM is just push fit sockets that have a release clip you need to pull if the socket is already populated. The RAM can only go in one way, its super super easy. Just make sure you double check the spec of RAM you buying against the laptop specs to make sure you buy the right sort.










I felt such an idiot when I realized their band name translates to angina, I kept reading it as poutine for some reason.
Microtonal but with super catchy riffs, thumbs up from me.
This performance has just broke out for them.