Recommendation: Lay out all the parts clearly first so that you always have a good overview of all the accessories. Only remove the screws from the (illustrated) box when you really need them. Together with the detailed and illustrated description, assembly is easy. All the necessary tools are included. If I was unsure (e.g. how to assemble the castors), I simply looked at a product picture to make sure I had interpreted the instructions correctly. Regarding "self-assembly": Yes, it's no problem! There is one point where a helping hand is recommended for about one minute for safety reasons (I also did this alone). This situation is also described.
I needed about 2.5 hours for the stress-free and comfortable assembly (without unpacking). Have fun - I can only recommend this product.

No problem setting up the unit. First lay everything out neatly and orderly. Took about 2.5 hours. Very good operating instructions available.

Although the question has already been answered, I can only confirm: First unpack and lay out everything. Then proceed according to the instructions. It took me about 2 hours to set up alone, but I would describe myself as technically experienced. I recorded the complete assembly in a time-lapse video: https://youtu.be/6YhKXetEXd...
The unit is very well made and robust.