The bars still have tension on them even with the arms all the way down. Otherwise, they'd fall out at max droop. Borrow the torsion bar tool from any auto parts store. It's all really not hard at all to work on. I'd imagine a rusty truck being a pain, but not ours. At least, I assume yours isn't rusty. Do not try to use a C-clamp! First thing is to mark everything where it sits so you can put it back just the same- Where the adjuster bolt is set at, left and right bars, which way is forward, which way it was clocked in the arm and the adjuster key, etc. Use the tool to push up on the key to unload the adjuster bolt, then zip the bolt out, remove the block, then back off the tool to lower the key and unload the bar until it all falls loose. Remove the bar and everything up front from there on is a bolt out/bolt in replacement.