One obstacle to working on airplanes is getting to where you can do the task at hand. We find it easier for a lot of the work in the fuselage is to simply turn it on its side. How? Glad you asked.
Put the nose gear up so the nose is on the ground laying on a piece of carpet. We use an engine hoist attached to the engine mount with a piece of rope or a strap. You could also just wrap rope all the way around the aft end of the fuselage if necessary without the engine mount.
The engine hoist is because we are a bunch of old farts who use leverage instead of raw muscle.