Assembly is very easy. I say that as someone who isn’t very handy.
The biggest problem for me was finding replacement parts, because I couldn’t find the parts listed in the manual at a webshop that would ship to Scandinavistan. This made me quit the build the first time I wanted to do it.
A few months later I came back with the mindset that a screw of a certain length is as good as any other and if the spring tension isn’t identical that’s probably fine too. This–obviously!–turned out to be true
If anyone in Europe ever puts together a build using online sources, it might be helpful if they shared the website they used and a shopping cart that led to a successful build. That might reduce friction for someone in the same situation later.