Nothing too bad there really, just depends on whatthe problems really are!

Starter motor could be half dead (usually easy to change depending on what car it is) or the wiring could be knackered (poor feed or earth)

Engine noise could be tappets or oculd be piston slap etc, usually hard to tell unles you know what you are doing.

Wiring loom replacement isn't too bad a job but quite labour intensive unless you do it yourself. (Assuming a 2wd saph on that one!)