Trouble getting a slant six in the car

I got it in the mount but now the problem is I can’t get the driveline back in. I mean I can’t possibly be expected to try and rip the engine in and also try and guide the shaft in. I’d have to be in two places at once. How is it done??
Remove the drive shaft from the rear end. Then install it into the transmission and reinstall it in to the yoke in the rear end.