A LOT of what's needed can be done by one person. One person who knows a trusted handyman is way more capable.
On the other hand, when I didn't have anyone who did drywall, I invented clever ways to hide things that have blown away a GC or two!
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw