I've done it.. I wouldn't say it'* overly bad, however the possibility for pain and blood does exist.
I pulled out a 1/2" ratchet with the smallest MM deep well socket and put them together. You basically have to lay in the trunk and move the bar on each side from the first position to the second. At that point, they are usually tight enough to hold up the trunk lid. From there, only move one at a time.. see how the trunk holds up or pops open.
All it really takes ia a long L shaped tool.. slide the short end over the end of the bar and use the rest as leverage.
As Pat warned.. there is pain potential here..
00 Regal GS: All kinds of cool stuff.