Trouble getting a slant six in the car

Pull the transmission and install it with the motor. This will actually make the job easier as you can tighten bolts that will be easier to reach out of the car. Slide the whole works in and align the mounts "done"

that would probably make it worse since I don’t have a load leveler for my hoist. Like I said I did this same thing just a few weeks ago and it took like 3 hours and it was done. I can’t figure out why I’m having so much trouble now. Should I drop the drive shaft and shove the trans back further?