1950s 1950 headlight switch replacement questions

[Daffer]

I Just got my car back from my mechanic after getting the whole brake system replaced, tires and having my carb tuned I drove to my grandparents 5 miles away furthest ive ever driven it, had so much fun id like to have it road worth at night to get ice cream but my dash lights dont turn on (they did on fog lights but I turned it a bit to try to get them on with headlights but messed it up. The rheostat was super finicky) so im wondering how difficult is it to replace the switch? I have a new one and would love to get them working reliably. Any insight is much appreciated! Also what's the process of removing the old one ive read the parking brake has to be removed is it possible with out doing that?
Thanks, Joshua