Emergency: Trying to change oil pump on 65 again

I tried this last summer with no success. It's a 170 65 Valiant. I was changing the RH motor mount and didn't know the condition of the oil pump or the actual mileage so I wanted to go ahead and change it. Me and a friend battled with it for a couple days each hours a day. I tried doing it exactly by the 65 Plymouth service guide even cutting a piece of 2x4 just like specified. Now I really need to do it because I need to actually move this car so I may as well just wrap it up under the hood. I got my new engine harness. The only thing left under the hood is I'm waiting on that RH motor mount and I have to figure out to get the oil pump out and new back in. We gave up last time and said we'll just pull the engine out but that's actually a lot more trouble that it's worth since the car is so far away from my house and all my lifting equipment is here and very heavy. If I could just change out this pump I should be able to quickly bolt back all the accessories on and start this car up and move it out of the way. I'm worried because it's parked under an old oak tree and a lot have been falling lately because of the storms. There pretty much isn't a safe place in the yard so I want to get it going and out of there. A 10ft branch fell right beside it the other day after a storm, it probably weighed about 25lbs. That's really all there is to do in order to start it up and move it. Swap out the oil pump, put the motor mount in, and change the plugs and wires. I was just wondering if anyone has come up with any tricks lately in order to get it out more easily.