it's pretty straightforward, just needs to be followed spot on otherwise it won't work. The trickiest bit is feeling for the storage lid motor which you can't see, but as long as that's one's re-engaged there's no problem.

The microswitches are a bit of a pain. They're not difficult, but it's a really fiddly and time-consuming job tracing the wiring etc.

Would be worth getting an electrical tester on everything to try and trace a fault if it's electrical and a diagnostics check if you know someone who can do that or somewhere that will just do that for a small fee.