Yes, what fears me is
1. this one screw which brakes in the engine block and needs to be drilled out
2. not knowing the torque specs
3. the timing chain assembly.
Little History: I worked on a motorcycle 4cylinder dohc before and wanted to replace the bottom sealing of the cylinder as it was leaking oil. Obviously one of the long screws holding the cylinder down broke just above the crank case during disassembly and it ended up in a mayor headache. I had a good manual with all torque specs (Yes, I am using a torque wrench... even when I put my tires on
) but it was not quite clear described how the timing chain has to be set. Result was: I put the cam assembly back on the cylinders and did not put the timing chain tentioner under load. The cams were off 1 chain link... luckily nothing was damaged and after correnting it, it worked just fine...
I studied mechanical and electrical engineering, but my tendency is more towards the electric/software side. For me it would be probably easier doing the electrical stuff than the mechanical.
Anyway, no decision made yet and sometimes you need to face a new challenge!