What difference does it make where you live?
The challenges are:
Your electrical ability
Can you learn from youtube video
Which service do u have? 100 or 200 amp, determines size of breaker, 50 or 100
Where is CB panel, this how many feet of wire you need, mine had to go thru outside wall.
Inside of garage is easy.
I did mine in one hour, by myself. Honest, you cant screw it up, red, black, white, green wire.
When you pull cover off main, you will how easy it is.
Good luck.