Played double bass for a good friend's MA performance exam (she was the singer) after twätting my middle finger with a hammer the day before.
I did not play to my full potential.
A doddle. I've had a couple of these, mine were the ones with solder lugs, so this one, which has the screw terminals will be even easier.
Do it. Honestly these are the best after-market preamps I've ever put in a jazz.
These two are very different beasts. The RS77 are much higher tension than the Nexus strings; if you're going to move to 77s from the nexus then drop a gauge e.g. .105" to .100", that will mitigate the increased stiffness.