I had remote start on my last car. It was a manual. Just was the biggest pain because there are so many things to do i just quit doing it.
But since you want to know it was like:
Engage clutch, put in neutral, pull ebrake, open door, turn off engine, release clutch, get out and close door, and hit lock. Idk if all are that complex but mine was. Didn't help the guy that installed it did janky work.