If you want to ensure there is no pressure, disconnect just the hydraulic pump motor's wire. Once that's disconnected cycle the switch up and down. You should hear just the valves clicking. This should allow the pressure to equalize. You'll still get some drips, just have some rags ready and tie the lines up so the fluid doesn't run out.
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS