Find all the tips and instructions to carry out the work yourself.
A good hammer, an iron file, a set of Allen keys and a set of open-ended wrenches (8 to 27). Make sure you also have access to thread seal tape (or hydraulic coupling glue) and threadlock.
In the kit to be assembled, you just have to assemble the parts. All parts are already drilled and tapped. There is no welding to do. In the already assembled version, machines are delivered ready to use, you therefore have nothing to do yourself.