It depends on if you want to put them back on.
If you don't, an angle grinder works fine.
If you do - then the only way is to pull the tank, disconnect 'em at the carb pull, and if you don't wanna bang or scratch anything as they swivel around (when you unscrew them from the bottom of the switch housing) , feed them back out so they hang away from the bike.
Just remember how they were routed so you don't end up with them binding as you near steering lock in either direction.