Sure looks like they could both be dropped whole behond the house if the shed & propane tank were moved. The drop zone is obviously not wide open there for a rookie, but hopefully is plenty big enough in the eyes of a pro. Maybe you move the shed & propane, hire a pro to drop the two trees behind the house, then he goes home and you take it from there. I would think that would drop the price low enough to make it worth avoiding the risk all together. You might even get a pretty cheap price by moving the shed, propane, and dog cage, then hiring the pro to climb and take them down. Eliminating the need to rig anything and hiring him only to get it to the ground should be pretty cheap.
It's worth exploring those options to see where they get you.
It's worth exploring those options to see where they get you.