I have 1 15 amp circuit that powers the entire garage. Yes. I have tripped the circuit. Too many times in fact. It will cost me $800 to $1200 to get someone to run a line for the subpanel and a couple of circuits. OR I could do it myself. It looks like a fairly straight shot to the garage without digging up anything or destroying multiple walls.
Is it doable? Is it reasonable to think a "Handy" man can do it?
Tim